Pileus Git - ~andy/linux/blob - drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/smp_lock.h>
  93 #include <linux/tiocl.h>
  94 #include <linux/kbd_kern.h>
  95 #include <linux/consolemap.h>
  96 #include <linux/timer.h>
  97 #include <linux/interrupt.h>
  98 #include <linux/workqueue.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107 #include <linux/kdb.h>
 108 #include <linux/ctype.h>
 109
 110 #define MAX_NR_CON_DRIVER 16
 111
 112 #define CON_DRIVER_FLAG_MODULE 1
 113 #define CON_DRIVER_FLAG_INIT   2
 114 #define CON_DRIVER_FLAG_ATTR   4
 115
 116 struct con_driver {
 117         const struct consw *con;
 118         const char *desc;
 119         struct device *dev;
 120         int node;
 121         int first;
 122         int last;
 123         int flag;
 124 };
 125
 126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 127 const struct consw *conswitchp;
 128
 129 /* A bitmap for codes <32. A bit of 1 indicates that the code
 130  * corresponding to that bit number invokes some special action
 131  * (such as cursor movement) and should not be displayed as a
 132  * glyph unless the disp_ctrl mode is explicitly enabled.
 133  */
 134 #define CTRL_ACTION 0x0d00ff81
 135 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 136
 137 /*
 138  * Here is the default bell parameters: 750HZ, 1/8th of a second
 139  */
 140 #define DEFAULT_BELL_PITCH      750
 141 #define DEFAULT_BELL_DURATION   (HZ/8)
 142
 143 struct vc vc_cons [MAX_NR_CONSOLES];
 144
 145 #ifndef VT_SINGLE_DRIVER
 146 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 147 #endif
 148
 149 static int con_open(struct tty_struct *, struct file *);
 150 static void vc_init(struct vc_data *vc, unsigned int rows,
 151                     unsigned int cols, int do_clear);
 152 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 153 static void save_cur(struct vc_data *vc);
 154 static void reset_terminal(struct vc_data *vc, int do_clear);
 155 static void con_flush_chars(struct tty_struct *tty);
 156 static int set_vesa_blanking(char __user *p);
 157 static void set_cursor(struct vc_data *vc);
 158 static void hide_cursor(struct vc_data *vc);
 159 static void console_callback(struct work_struct *ignored);
 160 static void blank_screen_t(unsigned long dummy);
 161 static void set_palette(struct vc_data *vc);
 162
 163 static int printable;           /* Is console ready for printing? */
 164 int default_utf8 = true;
 165 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 166 int global_cursor_default = -1;
 167 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 168
 169 static int cur_default = CUR_DEFAULT;
 170 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 171
 172 /*
 173  * ignore_poke: don't unblank the screen when things are typed.  This is
 174  * mainly for the privacy of braille terminal users.
 175  */
 176 static int ignore_poke;
 177
 178 int do_poke_blanked_console;
 179 int console_blanked;
 180
 181 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 182 static int vesa_off_interval;
 183 static int blankinterval = 10*60;
 184 core_param(consoleblank, blankinterval, int, 0444);
 185
 186 static DECLARE_WORK(console_work, console_callback);
 187
 188 /*
 189  * fg_console is the current virtual console,
 190  * last_console is the last used one,
 191  * want_console is the console we want to switch to,
 192  * saved_* variants are for save/restore around kernel debugger enter/leave
 193  */
 194 int fg_console;
 195 int last_console;
 196 int want_console = -1;
 197 int saved_fg_console;
 198 int saved_last_console;
 199 int saved_want_console;
 200 int saved_vc_mode;
 201
 202 /*
 203  * For each existing display, we have a pointer to console currently visible
 204  * on that display, allowing consoles other than fg_console to be refreshed
 205  * appropriately. Unless the low-level driver supplies its own display_fg
 206  * variable, we use this one for the "master display".
 207  */
 208 static struct vc_data *master_display_fg;
 209
 210 /*
 211  * Unfortunately, we need to delay tty echo when we're currently writing to the
 212  * console since the code is (and always was) not re-entrant, so we schedule
 213  * all flip requests to process context with schedule-task() and run it from
 214  * console_callback().
 215  */
 216
 217 /*
 218  * For the same reason, we defer scrollback to the console callback.
 219  */
 220 static int scrollback_delta;
 221
 222 /*
 223  * Hook so that the power management routines can (un)blank
 224  * the console on our behalf.
 225  */
 226 int (*console_blank_hook)(int);
 227
 228 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 229 static int blank_state;
 230 static int blank_timer_expired;
 231 enum {
 232         blank_off = 0,
 233         blank_normal_wait,
 234         blank_vesa_wait,
 235 };
 236
 237 /*
 238  * Notifier list for console events.
 239  */
 240 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 241
 242 int register_vt_notifier(struct notifier_block *nb)
 243 {
 244         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 245 }
 246 EXPORT_SYMBOL_GPL(register_vt_notifier);
 247
 248 int unregister_vt_notifier(struct notifier_block *nb)
 249 {
 250         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 251 }
 252 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 253
 254 static void notify_write(struct vc_data *vc, unsigned int unicode)
 255 {
 256         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 257         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 258 }
 259
 260 static void notify_update(struct vc_data *vc)
 261 {
 262         struct vt_notifier_param param = { .vc = vc };
 263         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 264 }
 265 /*
 266  *      Low-Level Functions
 267  */
 268
 269 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 270
 271 #ifdef VT_BUF_VRAM_ONLY
 272 #define DO_UPDATE(vc)   0
 273 #else
 274 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 275 #endif
 276
 277 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 278 {
 279         unsigned short *p;
 280
 281         if (!viewed)
 282                 p = (unsigned short *)(vc->vc_origin + offset);
 283         else if (!vc->vc_sw->con_screen_pos)
 284                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 285         else
 286                 p = vc->vc_sw->con_screen_pos(vc, offset);
 287         return p;
 288 }
 289
 290 static inline void scrolldelta(int lines)
 291 {
 292         scrollback_delta += lines;
 293         schedule_console_callback();
 294 }
 295
 296 void schedule_console_callback(void)
 297 {
 298         schedule_work(&console_work);
 299 }
 300
 301 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 302 {
 303         unsigned short *d, *s;
 304
 305         if (t+nr >= b)
 306                 nr = b - t - 1;
 307         if (b > vc->vc_rows || t >= b || nr < 1)
 308                 return;
 309         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 310                 return;
 311         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 312         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 313         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 314         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 315                     vc->vc_size_row * nr);
 316 }
 317
 318 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 319 {
 320         unsigned short *s;
 321         unsigned int step;
 322
 323         if (t+nr >= b)
 324                 nr = b - t - 1;
 325         if (b > vc->vc_rows || t >= b || nr < 1)
 326                 return;
 327         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 328                 return;
 329         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 330         step = vc->vc_cols * nr;
 331         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 332         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 333 }
 334
 335 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 336 {
 337 #ifndef VT_BUF_VRAM_ONLY
 338         unsigned int xx, yy, offset;
 339         u16 *p;
 340
 341         p = (u16 *) start;
 342         if (!vc->vc_sw->con_getxy) {
 343                 offset = (start - vc->vc_origin) / 2;
 344                 xx = offset % vc->vc_cols;
 345                 yy = offset / vc->vc_cols;
 346         } else {
 347                 int nxx, nyy;
 348                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 349                 xx = nxx; yy = nyy;
 350         }
 351         for(;;) {
 352                 u16 attrib = scr_readw(p) & 0xff00;
 353                 int startx = xx;
 354                 u16 *q = p;
 355                 while (xx < vc->vc_cols && count) {
 356                         if (attrib != (scr_readw(p) & 0xff00)) {
 357                                 if (p > q)
 358                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 359                                 startx = xx;
 360                                 q = p;
 361                                 attrib = scr_readw(p) & 0xff00;
 362                         }
 363                         p++;
 364                         xx++;
 365                         count--;
 366                 }
 367                 if (p > q)
 368                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 369                 if (!count)
 370                         break;
 371                 xx = 0;
 372                 yy++;
 373                 if (vc->vc_sw->con_getxy) {
 374                         p = (u16 *)start;
 375                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 376                 }
 377         }
 378 #endif
 379 }
 380
 381 void update_region(struct vc_data *vc, unsigned long start, int count)
 382 {
 383         WARN_CONSOLE_UNLOCKED();
 384
 385         if (DO_UPDATE(vc)) {
 386                 hide_cursor(vc);
 387                 do_update_region(vc, start, count);
 388                 set_cursor(vc);
 389         }
 390 }
 391
 392 /* Structure of attributes is hardware-dependent */
 393
 394 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 395     u8 _underline, u8 _reverse, u8 _italic)
 396 {
 397         if (vc->vc_sw->con_build_attr)
 398                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 399                        _blink, _underline, _reverse, _italic);
 400
 401 #ifndef VT_BUF_VRAM_ONLY
 402 /*
 403  * ++roman: I completely changed the attribute format for monochrome
 404  * mode (!can_do_color). The formerly used MDA (monochrome display
 405  * adapter) format didn't allow the combination of certain effects.
 406  * Now the attribute is just a bit vector:
 407  *  Bit 0..1: intensity (0..2)
 408  *  Bit 2   : underline
 409  *  Bit 3   : reverse
 410  *  Bit 7   : blink
 411  */
 412         {
 413         u8 a = _color;
 414         if (!vc->vc_can_do_color)
 415                 return _intensity |
 416                        (_italic ? 2 : 0) |
 417                        (_underline ? 4 : 0) |
 418                        (_reverse ? 8 : 0) |
 419                        (_blink ? 0x80 : 0);
 420         if (_italic)
 421                 a = (a & 0xF0) | vc->vc_itcolor;
 422         else if (_underline)
 423                 a = (a & 0xf0) | vc->vc_ulcolor;
 424         else if (_intensity == 0)
 425                 a = (a & 0xf0) | vc->vc_ulcolor;
 426         if (_reverse)
 427                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 428         if (_blink)
 429                 a ^= 0x80;
 430         if (_intensity == 2)
 431                 a ^= 0x08;
 432         if (vc->vc_hi_font_mask == 0x100)
 433                 a <<= 1;
 434         return a;
 435         }
 436 #else
 437         return 0;
 438 #endif
 439 }
 440
 441 static void update_attr(struct vc_data *vc)
 442 {
 443         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 444                       vc->vc_blink, vc->vc_underline,
 445                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 446         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 447 }
 448
 449 /* Note: inverting the screen twice should revert to the original state */
 450 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 451 {
 452         unsigned short *p;
 453
 454         WARN_CONSOLE_UNLOCKED();
 455
 456         count /= 2;
 457         p = screenpos(vc, offset, viewed);
 458         if (vc->vc_sw->con_invert_region)
 459                 vc->vc_sw->con_invert_region(vc, p, count);
 460 #ifndef VT_BUF_VRAM_ONLY
 461         else {
 462                 u16 *q = p;
 463                 int cnt = count;
 464                 u16 a;
 465
 466                 if (!vc->vc_can_do_color) {
 467                         while (cnt--) {
 468                             a = scr_readw(q);
 469                             a ^= 0x0800;
 470                             scr_writew(a, q);
 471                             q++;
 472                         }
 473                 } else if (vc->vc_hi_font_mask == 0x100) {
 474                         while (cnt--) {
 475                                 a = scr_readw(q);
 476                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 477                                 scr_writew(a, q);
 478                                 q++;
 479                         }
 480                 } else {
 481                         while (cnt--) {
 482                                 a = scr_readw(q);
 483                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 484                                 scr_writew(a, q);
 485                                 q++;
 486                         }
 487                 }
 488         }
 489 #endif
 490         if (DO_UPDATE(vc))
 491                 do_update_region(vc, (unsigned long) p, count);
 492 }
 493
 494 /* used by selection: complement pointer position */
 495 void complement_pos(struct vc_data *vc, int offset)
 496 {
 497         static int old_offset = -1;
 498         static unsigned short old;
 499         static unsigned short oldx, oldy;
 500
 501         WARN_CONSOLE_UNLOCKED();
 502
 503         if (old_offset != -1 && old_offset >= 0 &&
 504             old_offset < vc->vc_screenbuf_size) {
 505                 scr_writew(old, screenpos(vc, old_offset, 1));
 506                 if (DO_UPDATE(vc))
 507                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 508         }
 509
 510         old_offset = offset;
 511
 512         if (offset != -1 && offset >= 0 &&
 513             offset < vc->vc_screenbuf_size) {
 514                 unsigned short new;
 515                 unsigned short *p;
 516                 p = screenpos(vc, offset, 1);
 517                 old = scr_readw(p);
 518                 new = old ^ vc->vc_complement_mask;
 519                 scr_writew(new, p);
 520                 if (DO_UPDATE(vc)) {
 521                         oldx = (offset >> 1) % vc->vc_cols;
 522                         oldy = (offset >> 1) / vc->vc_cols;
 523                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 524                 }
 525         }
 526
 527 }
 528
 529 static void insert_char(struct vc_data *vc, unsigned int nr)
 530 {
 531         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 532
 533         p = q + vc->vc_cols - nr - vc->vc_x;
 534         while (--p >= q)
 535                 scr_writew(scr_readw(p), p + nr);
 536         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 537         vc->vc_need_wrap = 0;
 538         if (DO_UPDATE(vc)) {
 539                 unsigned short oldattr = vc->vc_attr;
 540                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 541                                      vc->vc_cols - vc->vc_x - nr);
 542                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 543                 while (nr--)
 544                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 545                 vc->vc_attr = oldattr;
 546         }
 547 }
 548
 549 static void delete_char(struct vc_data *vc, unsigned int nr)
 550 {
 551         unsigned int i = vc->vc_x;
 552         unsigned short *p = (unsigned short *)vc->vc_pos;
 553
 554         while (++i <= vc->vc_cols - nr) {
 555                 scr_writew(scr_readw(p+nr), p);
 556                 p++;
 557         }
 558         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 559         vc->vc_need_wrap = 0;
 560         if (DO_UPDATE(vc)) {
 561                 unsigned short oldattr = vc->vc_attr;
 562                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 563                                      vc->vc_cols - vc->vc_x - nr);
 564                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 565                 while (nr--)
 566                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 567                                      vc->vc_cols - 1 - nr);
 568                 vc->vc_attr = oldattr;
 569         }
 570 }
 571
 572 static int softcursor_original;
 573
 574 static void add_softcursor(struct vc_data *vc)
 575 {
 576         int i = scr_readw((u16 *) vc->vc_pos);
 577         u32 type = vc->vc_cursor_type;
 578
 579         if (! (type & 0x10)) return;
 580         if (softcursor_original != -1) return;
 581         softcursor_original = i;
 582         i |= ((type >> 8) & 0xff00 );
 583         i ^= ((type) & 0xff00 );
 584         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 585         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 586         scr_writew(i, (u16 *) vc->vc_pos);
 587         if (DO_UPDATE(vc))
 588                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 589 }
 590
 591 static void hide_softcursor(struct vc_data *vc)
 592 {
 593         if (softcursor_original != -1) {
 594                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 595                 if (DO_UPDATE(vc))
 596                         vc->vc_sw->con_putc(vc, softcursor_original,
 597                                         vc->vc_y, vc->vc_x);
 598                 softcursor_original = -1;
 599         }
 600 }
 601
 602 static void hide_cursor(struct vc_data *vc)
 603 {
 604         if (vc == sel_cons)
 605                 clear_selection();
 606         vc->vc_sw->con_cursor(vc, CM_ERASE);
 607         hide_softcursor(vc);
 608 }
 609
 610 static void set_cursor(struct vc_data *vc)
 611 {
 612         if (!IS_FG(vc) || console_blanked ||
 613             vc->vc_mode == KD_GRAPHICS)
 614                 return;
 615         if (vc->vc_deccm) {
 616                 if (vc == sel_cons)
 617                         clear_selection();
 618                 add_softcursor(vc);
 619                 if ((vc->vc_cursor_type & 0x0f) != 1)
 620                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 621         } else
 622                 hide_cursor(vc);
 623 }
 624
 625 static void set_origin(struct vc_data *vc)
 626 {
 627         WARN_CONSOLE_UNLOCKED();
 628
 629         if (!CON_IS_VISIBLE(vc) ||
 630             !vc->vc_sw->con_set_origin ||
 631             !vc->vc_sw->con_set_origin(vc))
 632                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 633         vc->vc_visible_origin = vc->vc_origin;
 634         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 635         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 636 }
 637
 638 static inline void save_screen(struct vc_data *vc)
 639 {
 640         WARN_CONSOLE_UNLOCKED();
 641
 642         if (vc->vc_sw->con_save_screen)
 643                 vc->vc_sw->con_save_screen(vc);
 644 }
 645
 646 /*
 647  *      Redrawing of screen
 648  */
 649
 650 static void clear_buffer_attributes(struct vc_data *vc)
 651 {
 652         unsigned short *p = (unsigned short *)vc->vc_origin;
 653         int count = vc->vc_screenbuf_size / 2;
 654         int mask = vc->vc_hi_font_mask | 0xff;
 655
 656         for (; count > 0; count--, p++) {
 657                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 658         }
 659 }
 660
 661 void redraw_screen(struct vc_data *vc, int is_switch)
 662 {
 663         int redraw = 0;
 664
 665         WARN_CONSOLE_UNLOCKED();
 666
 667         if (!vc) {
 668                 /* strange ... */
 669                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 670                 return;
 671         }
 672
 673         if (is_switch) {
 674                 struct vc_data *old_vc = vc_cons[fg_console].d;
 675                 if (old_vc == vc)
 676                         return;
 677                 if (!CON_IS_VISIBLE(vc))
 678                         redraw = 1;
 679                 *vc->vc_display_fg = vc;
 680                 fg_console = vc->vc_num;
 681                 hide_cursor(old_vc);
 682                 if (!CON_IS_VISIBLE(old_vc)) {
 683                         save_screen(old_vc);
 684                         set_origin(old_vc);
 685                 }
 686         } else {
 687                 hide_cursor(vc);
 688                 redraw = 1;
 689         }
 690
 691         if (redraw) {
 692                 int update;
 693                 int old_was_color = vc->vc_can_do_color;
 694
 695                 set_origin(vc);
 696                 update = vc->vc_sw->con_switch(vc);
 697                 set_palette(vc);
 698                 /*
 699                  * If console changed from mono<->color, the best we can do
 700                  * is to clear the buffer attributes. As it currently stands,
 701                  * rebuilding new attributes from the old buffer is not doable
 702                  * without overly complex code.
 703                  */
 704                 if (old_was_color != vc->vc_can_do_color) {
 705                         update_attr(vc);
 706                         clear_buffer_attributes(vc);
 707                 }
 708                 if (update && vc->vc_mode != KD_GRAPHICS)
 709                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 710         }
 711         set_cursor(vc);
 712         if (is_switch) {
 713                 set_leds();
 714                 compute_shiftstate();
 715                 notify_update(vc);
 716         }
 717 }
 718
 719 /*
 720  *      Allocation, freeing and resizing of VTs.
 721  */
 722
 723 int vc_cons_allocated(unsigned int i)
 724 {
 725         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 726 }
 727
 728 static void visual_init(struct vc_data *vc, int num, int init)
 729 {
 730         /* ++Geert: vc->vc_sw->con_init determines console size */
 731         if (vc->vc_sw)
 732                 module_put(vc->vc_sw->owner);
 733         vc->vc_sw = conswitchp;
 734 #ifndef VT_SINGLE_DRIVER
 735         if (con_driver_map[num])
 736                 vc->vc_sw = con_driver_map[num];
 737 #endif
 738         __module_get(vc->vc_sw->owner);
 739         vc->vc_num = num;
 740         vc->vc_display_fg = &master_display_fg;
 741         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 742         vc->vc_uni_pagedir = 0;
 743         vc->vc_hi_font_mask = 0;
 744         vc->vc_complement_mask = 0;
 745         vc->vc_can_do_color = 0;
 746         vc->vc_sw->con_init(vc, init);
 747         if (!vc->vc_complement_mask)
 748                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 749         vc->vc_s_complement_mask = vc->vc_complement_mask;
 750         vc->vc_size_row = vc->vc_cols << 1;
 751         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 752 }
 753
 754 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 755 {
 756         WARN_CONSOLE_UNLOCKED();
 757
 758         if (currcons >= MAX_NR_CONSOLES)
 759                 return -ENXIO;
 760         if (!vc_cons[currcons].d) {
 761             struct vc_data *vc;
 762             struct vt_notifier_param param;
 763
 764             /* prevent users from taking too much memory */
 765             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 766               return -EPERM;
 767
 768             /* due to the granularity of kmalloc, we waste some memory here */
 769             /* the alloc is done in two steps, to optimize the common situation
 770                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 771             /* although the numbers above are not valid since long ago, the
 772                point is still up-to-date and the comment still has its value
 773                even if only as a historical artifact.  --mj, July 1998 */
 774             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 775             if (!vc)
 776                 return -ENOMEM;
 777             vc_cons[currcons].d = vc;
 778             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 779             visual_init(vc, currcons, 1);
 780             if (!*vc->vc_uni_pagedir_loc)
 781                 con_set_default_unimap(vc);
 782             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 783             if (!vc->vc_screenbuf) {
 784                 kfree(vc);
 785                 vc_cons[currcons].d = NULL;
 786                 return -ENOMEM;
 787             }
 788
 789             /* If no drivers have overridden us and the user didn't pass a
 790                boot option, default to displaying the cursor */
 791             if (global_cursor_default == -1)
 792                     global_cursor_default = 1;
 793
 794             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 795             vcs_make_sysfs(currcons);
 796             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 797         }
 798         return 0;
 799 }
 800
 801 static inline int resize_screen(struct vc_data *vc, int width, int height,
 802                                 int user)
 803 {
 804         /* Resizes the resolution of the display adapater */
 805         int err = 0;
 806
 807         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 808                 err = vc->vc_sw->con_resize(vc, width, height, user);
 809
 810         return err;
 811 }
 812
 813 /*
 814  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 815  * [this is to be used together with some user program
 816  * like resize that changes the hardware videomode]
 817  */
 818 #define VC_RESIZE_MAXCOL (32767)
 819 #define VC_RESIZE_MAXROW (32767)
 820
 821 /**
 822  *      vc_do_resize    -       resizing method for the tty
 823  *      @tty: tty being resized
 824  *      @real_tty: real tty (different to tty if a pty/tty pair)
 825  *      @vc: virtual console private data
 826  *      @cols: columns
 827  *      @lines: lines
 828  *
 829  *      Resize a virtual console, clipping according to the actual constraints.
 830  *      If the caller passes a tty structure then update the termios winsize
 831  *      information and perform any necessary signal handling.
 832  *
 833  *      Caller must hold the console semaphore. Takes the termios mutex and
 834  *      ctrl_lock of the tty IFF a tty is passed.
 835  */
 836
 837 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 838                                 unsigned int cols, unsigned int lines)
 839 {
 840         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 841         unsigned long end;
 842         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 843         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 844         unsigned int user;
 845         unsigned short *newscreen;
 846
 847         WARN_CONSOLE_UNLOCKED();
 848
 849         if (!vc)
 850                 return -ENXIO;
 851
 852         user = vc->vc_resize_user;
 853         vc->vc_resize_user = 0;
 854
 855         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 856                 return -EINVAL;
 857
 858         new_cols = (cols ? cols : vc->vc_cols);
 859         new_rows = (lines ? lines : vc->vc_rows);
 860         new_row_size = new_cols << 1;
 861         new_screen_size = new_row_size * new_rows;
 862
 863         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 864                 return 0;
 865
 866         newscreen = kmalloc(new_screen_size, GFP_USER);
 867         if (!newscreen)
 868                 return -ENOMEM;
 869
 870         old_rows = vc->vc_rows;
 871         old_cols = vc->vc_cols;
 872         old_row_size = vc->vc_size_row;
 873         old_screen_size = vc->vc_screenbuf_size;
 874
 875         err = resize_screen(vc, new_cols, new_rows, user);
 876         if (err) {
 877                 kfree(newscreen);
 878                 return err;
 879         }
 880
 881         vc->vc_rows = new_rows;
 882         vc->vc_cols = new_cols;
 883         vc->vc_size_row = new_row_size;
 884         vc->vc_screenbuf_size = new_screen_size;
 885
 886         rlth = min(old_row_size, new_row_size);
 887         rrem = new_row_size - rlth;
 888         old_origin = vc->vc_origin;
 889         new_origin = (long) newscreen;
 890         new_scr_end = new_origin + new_screen_size;
 891
 892         if (vc->vc_y > new_rows) {
 893                 if (old_rows - vc->vc_y < new_rows) {
 894                         /*
 895                          * Cursor near the bottom, copy contents from the
 896                          * bottom of buffer
 897                          */
 898                         old_origin += (old_rows - new_rows) * old_row_size;
 899                         end = vc->vc_scr_end;
 900                 } else {
 901                         /*
 902                          * Cursor is in no man's land, copy 1/2 screenful
 903                          * from the top and bottom of cursor position
 904                          */
 905                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 906                         end = old_origin + (old_row_size * new_rows);
 907                 }
 908         } else
 909                 /*
 910                  * Cursor near the top, copy contents from the top of buffer
 911                  */
 912                 end = (old_rows > new_rows) ? old_origin +
 913                         (old_row_size * new_rows) :
 914                         vc->vc_scr_end;
 915
 916         update_attr(vc);
 917
 918         while (old_origin < end) {
 919                 scr_memcpyw((unsigned short *) new_origin,
 920                             (unsigned short *) old_origin, rlth);
 921                 if (rrem)
 922                         scr_memsetw((void *)(new_origin + rlth),
 923                                     vc->vc_video_erase_char, rrem);
 924                 old_origin += old_row_size;
 925                 new_origin += new_row_size;
 926         }
 927         if (new_scr_end > new_origin)
 928                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 929                             new_scr_end - new_origin);
 930         kfree(vc->vc_screenbuf);
 931         vc->vc_screenbuf = newscreen;
 932         vc->vc_screenbuf_size = new_screen_size;
 933         set_origin(vc);
 934
 935         /* do part of a reset_terminal() */
 936         vc->vc_top = 0;
 937         vc->vc_bottom = vc->vc_rows;
 938         gotoxy(vc, vc->vc_x, vc->vc_y);
 939         save_cur(vc);
 940
 941         if (tty) {
 942                 /* Rewrite the requested winsize data with the actual
 943                    resulting sizes */
 944                 struct winsize ws;
 945                 memset(&ws, 0, sizeof(ws));
 946                 ws.ws_row = vc->vc_rows;
 947                 ws.ws_col = vc->vc_cols;
 948                 ws.ws_ypixel = vc->vc_scan_lines;
 949                 tty_do_resize(tty, &ws);
 950         }
 951
 952         if (CON_IS_VISIBLE(vc))
 953                 update_screen(vc);
 954         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 955         return err;
 956 }
 957
 958 /**
 959  *      vc_resize               -       resize a VT
 960  *      @vc: virtual console
 961  *      @cols: columns
 962  *      @rows: rows
 963  *
 964  *      Resize a virtual console as seen from the console end of things. We
 965  *      use the common vc_do_resize methods to update the structures. The
 966  *      caller must hold the console sem to protect console internals and
 967  *      vc->vc_tty
 968  */
 969
 970 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 971 {
 972         return vc_do_resize(vc->vc_tty, vc, cols, rows);
 973 }
 974
 975 /**
 976  *      vt_resize               -       resize a VT
 977  *      @tty: tty to resize
 978  *      @ws: winsize attributes
 979  *
 980  *      Resize a virtual terminal. This is called by the tty layer as we
 981  *      register our own handler for resizing. The mutual helper does all
 982  *      the actual work.
 983  *
 984  *      Takes the console sem and the called methods then take the tty
 985  *      termios_mutex and the tty ctrl_lock in that order.
 986  */
 987 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 988 {
 989         struct vc_data *vc = tty->driver_data;
 990         int ret;
 991
 992         acquire_console_sem();
 993         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 994         release_console_sem();
 995         return ret;
 996 }
 997
 998 void vc_deallocate(unsigned int currcons)
 999 {
1000         WARN_CONSOLE_UNLOCKED();
1001
1002         if (vc_cons_allocated(currcons)) {
1003                 struct vc_data *vc = vc_cons[currcons].d;
1004                 struct vt_notifier_param param = { .vc = vc };
1005
1006                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1007                 vcs_remove_sysfs(currcons);
1008                 vc->vc_sw->con_deinit(vc);
1009                 put_pid(vc->vt_pid);
1010                 module_put(vc->vc_sw->owner);
1011                 kfree(vc->vc_screenbuf);
1012                 if (currcons >= MIN_NR_CONSOLES)
1013                         kfree(vc);
1014                 vc_cons[currcons].d = NULL;
1015         }
1016 }
1017
1018 /*
1019  *      VT102 emulator
1020  */
1021
1022 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1023 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1024 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1025
1026 #define decarm          VC_REPEAT
1027 #define decckm          VC_CKMODE
1028 #define kbdapplic       VC_APPLIC
1029 #define lnm             VC_CRLF
1030
1031 /*
1032  * this is what the terminal answers to a ESC-Z or csi0c query.
1033  */
1034 #define VT100ID "\033[?1;2c"
1035 #define VT102ID "\033[?6c"
1036
1037 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1038                                        8,12,10,14, 9,13,11,15 };
1039
1040 /* the default colour table, for VGA+ colour systems */
1041 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1042     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1043 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1044     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1045 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1046     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1047
1048 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1049 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1050 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1051
1052 /*
1053  * gotoxy() must verify all boundaries, because the arguments
1054  * might also be negative. If the given position is out of
1055  * bounds, the cursor is placed at the nearest margin.
1056  */
1057 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1058 {
1059         int min_y, max_y;
1060
1061         if (new_x < 0)
1062                 vc->vc_x = 0;
1063         else {
1064                 if (new_x >= vc->vc_cols)
1065                         vc->vc_x = vc->vc_cols - 1;
1066                 else
1067                         vc->vc_x = new_x;
1068         }
1069
1070         if (vc->vc_decom) {
1071                 min_y = vc->vc_top;
1072                 max_y = vc->vc_bottom;
1073         } else {
1074                 min_y = 0;
1075                 max_y = vc->vc_rows;
1076         }
1077         if (new_y < min_y)
1078                 vc->vc_y = min_y;
1079         else if (new_y >= max_y)
1080                 vc->vc_y = max_y - 1;
1081         else
1082                 vc->vc_y = new_y;
1083         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1084         vc->vc_need_wrap = 0;
1085 }
1086
1087 /* for absolute user moves, when decom is set */
1088 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1089 {
1090         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1091 }
1092
1093 void scrollback(struct vc_data *vc, int lines)
1094 {
1095         if (!lines)
1096                 lines = vc->vc_rows / 2;
1097         scrolldelta(-lines);
1098 }
1099
1100 void scrollfront(struct vc_data *vc, int lines)
1101 {
1102         if (!lines)
1103                 lines = vc->vc_rows / 2;
1104         scrolldelta(lines);
1105 }
1106
1107 static void lf(struct vc_data *vc)
1108 {
1109         /* don't scroll if above bottom of scrolling region, or
1110          * if below scrolling region
1111          */
1112         if (vc->vc_y + 1 == vc->vc_bottom)
1113                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1114         else if (vc->vc_y < vc->vc_rows - 1) {
1115                 vc->vc_y++;
1116                 vc->vc_pos += vc->vc_size_row;
1117         }
1118         vc->vc_need_wrap = 0;
1119         notify_write(vc, '\n');
1120 }
1121
1122 static void ri(struct vc_data *vc)
1123 {
1124         /* don't scroll if below top of scrolling region, or
1125          * if above scrolling region
1126          */
1127         if (vc->vc_y == vc->vc_top)
1128                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1129         else if (vc->vc_y > 0) {
1130                 vc->vc_y--;
1131                 vc->vc_pos -= vc->vc_size_row;
1132         }
1133         vc->vc_need_wrap = 0;
1134 }
1135
1136 static inline void cr(struct vc_data *vc)
1137 {
1138         vc->vc_pos -= vc->vc_x << 1;
1139         vc->vc_need_wrap = vc->vc_x = 0;
1140         notify_write(vc, '\r');
1141 }
1142
1143 static inline void bs(struct vc_data *vc)
1144 {
1145         if (vc->vc_x) {
1146                 vc->vc_pos -= 2;
1147                 vc->vc_x--;
1148                 vc->vc_need_wrap = 0;
1149                 notify_write(vc, '\b');
1150         }
1151 }
1152
1153 static inline void del(struct vc_data *vc)
1154 {
1155         /* ignored */
1156 }
1157
1158 static void csi_J(struct vc_data *vc, int vpar)
1159 {
1160         unsigned int count;
1161         unsigned short * start;
1162
1163         switch (vpar) {
1164                 case 0: /* erase from cursor to end of display */
1165                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1166                         start = (unsigned short *)vc->vc_pos;
1167                         if (DO_UPDATE(vc)) {
1168                                 /* do in two stages */
1169                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1170                                               vc->vc_cols - vc->vc_x);
1171                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1172                                               vc->vc_rows - vc->vc_y - 1,
1173                                               vc->vc_cols);
1174                         }
1175                         break;
1176                 case 1: /* erase from start to cursor */
1177                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1178                         start = (unsigned short *)vc->vc_origin;
1179                         if (DO_UPDATE(vc)) {
1180                                 /* do in two stages */
1181                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1182                                               vc->vc_cols);
1183                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1184                                               vc->vc_x + 1);
1185                         }
1186                         break;
1187                 case 2: /* erase whole display */
1188                         count = vc->vc_cols * vc->vc_rows;
1189                         start = (unsigned short *)vc->vc_origin;
1190                         if (DO_UPDATE(vc))
1191                                 vc->vc_sw->con_clear(vc, 0, 0,
1192                                               vc->vc_rows,
1193                                               vc->vc_cols);
1194                         break;
1195                 default:
1196                         return;
1197         }
1198         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1199         vc->vc_need_wrap = 0;
1200 }
1201
1202 static void csi_K(struct vc_data *vc, int vpar)
1203 {
1204         unsigned int count;
1205         unsigned short * start;
1206
1207         switch (vpar) {
1208                 case 0: /* erase from cursor to end of line */
1209                         count = vc->vc_cols - vc->vc_x;
1210                         start = (unsigned short *)vc->vc_pos;
1211                         if (DO_UPDATE(vc))
1212                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1213                                                      vc->vc_cols - vc->vc_x);
1214                         break;
1215                 case 1: /* erase from start of line to cursor */
1216                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1217                         count = vc->vc_x + 1;
1218                         if (DO_UPDATE(vc))
1219                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1220                                                      vc->vc_x + 1);
1221                         break;
1222                 case 2: /* erase whole line */
1223                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1224                         count = vc->vc_cols;
1225                         if (DO_UPDATE(vc))
1226                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1227                                               vc->vc_cols);
1228                         break;
1229                 default:
1230                         return;
1231         }
1232         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1233         vc->vc_need_wrap = 0;
1234 }
1235
1236 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1237 {                                         /* not vt100? */
1238         int count;
1239
1240         if (!vpar)
1241                 vpar++;
1242         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1243
1244         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1245         if (DO_UPDATE(vc))
1246                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1247         vc->vc_need_wrap = 0;
1248 }
1249
1250 static void default_attr(struct vc_data *vc)
1251 {
1252         vc->vc_intensity = 1;
1253         vc->vc_italic = 0;
1254         vc->vc_underline = 0;
1255         vc->vc_reverse = 0;
1256         vc->vc_blink = 0;
1257         vc->vc_color = vc->vc_def_color;
1258 }
1259
1260 /* console_sem is held */
1261 static void csi_m(struct vc_data *vc)
1262 {
1263         int i;
1264
1265         for (i = 0; i <= vc->vc_npar; i++)
1266                 switch (vc->vc_par[i]) {
1267                         case 0: /* all attributes off */
1268                                 default_attr(vc);
1269                                 break;
1270                         case 1:
1271                                 vc->vc_intensity = 2;
1272                                 break;
1273                         case 2:
1274                                 vc->vc_intensity = 0;
1275                                 break;
1276                         case 3:
1277                                 vc->vc_italic = 1;
1278                                 break;
1279                         case 4:
1280                                 vc->vc_underline = 1;
1281                                 break;
1282                         case 5:
1283                                 vc->vc_blink = 1;
1284                                 break;
1285                         case 7:
1286                                 vc->vc_reverse = 1;
1287                                 break;
1288                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1289                                   * Select primary font, don't display
1290                                   * control chars if defined, don't set
1291                                   * bit 8 on output.
1292                                   */
1293                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1294                                                 ? vc->vc_G0_charset
1295                                                 : vc->vc_G1_charset, vc);
1296                                 vc->vc_disp_ctrl = 0;
1297                                 vc->vc_toggle_meta = 0;
1298                                 break;
1299                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1300                                   * Select first alternate font, lets
1301                                   * chars < 32 be displayed as ROM chars.
1302                                   */
1303                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1304                                 vc->vc_disp_ctrl = 1;
1305                                 vc->vc_toggle_meta = 0;
1306                                 break;
1307                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1308                                   * Select second alternate font, toggle
1309                                   * high bit before displaying as ROM char.
1310                                   */
1311                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1312                                 vc->vc_disp_ctrl = 1;
1313                                 vc->vc_toggle_meta = 1;
1314                                 break;
1315                         case 21:
1316                         case 22:
1317                                 vc->vc_intensity = 1;
1318                                 break;
1319                         case 23:
1320                                 vc->vc_italic = 0;
1321                                 break;
1322                         case 24:
1323                                 vc->vc_underline = 0;
1324                                 break;
1325                         case 25:
1326                                 vc->vc_blink = 0;
1327                                 break;
1328                         case 27:
1329                                 vc->vc_reverse = 0;
1330                                 break;
1331                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1332                                   * Enables underscore, white foreground
1333                                   * with white underscore (Linux - use
1334                                   * default foreground).
1335                                   */
1336                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1337                                 vc->vc_underline = 1;
1338                                 break;
1339                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1340                                   * Disable underline option.
1341                                   * Reset colour to default? It did this
1342                                   * before...
1343                                   */
1344                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1345                                 vc->vc_underline = 0;
1346                                 break;
1347                         case 49:
1348                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1349                                 break;
1350                         default:
1351                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1352                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1353                                                 | (vc->vc_color & 0xf0);
1354                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1355                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1356                                                 | (vc->vc_color & 0x0f);
1357                                 break;
1358                 }
1359         update_attr(vc);
1360 }
1361
1362 static void respond_string(const char *p, struct tty_struct *tty)
1363 {
1364         while (*p) {
1365                 tty_insert_flip_char(tty, *p, 0);
1366                 p++;
1367         }
1368         con_schedule_flip(tty);
1369 }
1370
1371 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1372 {
1373         char buf[40];
1374
1375         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1376         respond_string(buf, tty);
1377 }
1378
1379 static inline void status_report(struct tty_struct *tty)
1380 {
1381         respond_string("\033[0n", tty); /* Terminal ok */
1382 }
1383
1384 static inline void respond_ID(struct tty_struct * tty)
1385 {
1386         respond_string(VT102ID, tty);
1387 }
1388
1389 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1390 {
1391         char buf[8];
1392
1393         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1394                 (char)('!' + mry));
1395         respond_string(buf, tty);
1396 }
1397
1398 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1399 int mouse_reporting(void)
1400 {
1401         return vc_cons[fg_console].d->vc_report_mouse;
1402 }
1403
1404 /* console_sem is held */
1405 static void set_mode(struct vc_data *vc, int on_off)
1406 {
1407         int i;
1408
1409         for (i = 0; i <= vc->vc_npar; i++)
1410                 if (vc->vc_ques) {
1411                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1412                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1413                                 if (on_off)
1414                                         set_kbd(vc, decckm);
1415                                 else
1416                                         clr_kbd(vc, decckm);
1417                                 break;
1418                         case 3: /* 80/132 mode switch unimplemented */
1419                                 vc->vc_deccolm = on_off;
1420 #if 0
1421                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1422                                 /* this alone does not suffice; some user mode
1423                                    utility has to change the hardware regs */
1424 #endif
1425                                 break;
1426                         case 5:                 /* Inverted screen on/off */
1427                                 if (vc->vc_decscnm != on_off) {
1428                                         vc->vc_decscnm = on_off;
1429                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1430                                         update_attr(vc);
1431                                 }
1432                                 break;
1433                         case 6:                 /* Origin relative/absolute */
1434                                 vc->vc_decom = on_off;
1435                                 gotoxay(vc, 0, 0);
1436                                 break;
1437                         case 7:                 /* Autowrap on/off */
1438                                 vc->vc_decawm = on_off;
1439                                 break;
1440                         case 8:                 /* Autorepeat on/off */
1441                                 if (on_off)
1442                                         set_kbd(vc, decarm);
1443                                 else
1444                                         clr_kbd(vc, decarm);
1445                                 break;
1446                         case 9:
1447                                 vc->vc_report_mouse = on_off ? 1 : 0;
1448                                 break;
1449                         case 25:                /* Cursor on/off */
1450                                 vc->vc_deccm = on_off;
1451                                 break;
1452                         case 1000:
1453                                 vc->vc_report_mouse = on_off ? 2 : 0;
1454                                 break;
1455                         }
1456                 } else {
1457                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1458                         case 3:                 /* Monitor (display ctrls) */
1459                                 vc->vc_disp_ctrl = on_off;
1460                                 break;
1461                         case 4:                 /* Insert Mode on/off */
1462                                 vc->vc_decim = on_off;
1463                                 break;
1464                         case 20:                /* Lf, Enter == CrLf/Lf */
1465                                 if (on_off)
1466                                         set_kbd(vc, lnm);
1467                                 else
1468                                         clr_kbd(vc, lnm);
1469                                 break;
1470                         }
1471                 }
1472 }
1473
1474 /* console_sem is held */
1475 static void setterm_command(struct vc_data *vc)
1476 {
1477         switch(vc->vc_par[0]) {
1478                 case 1: /* set color for underline mode */
1479                         if (vc->vc_can_do_color &&
1480                                         vc->vc_par[1] < 16) {
1481                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1482                                 if (vc->vc_underline)
1483                                         update_attr(vc);
1484                         }
1485                         break;
1486                 case 2: /* set color for half intensity mode */
1487                         if (vc->vc_can_do_color &&
1488                                         vc->vc_par[1] < 16) {
1489                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1490                                 if (vc->vc_intensity == 0)
1491                                         update_attr(vc);
1492                         }
1493                         break;
1494                 case 8: /* store colors as defaults */
1495                         vc->vc_def_color = vc->vc_attr;
1496                         if (vc->vc_hi_font_mask == 0x100)
1497                                 vc->vc_def_color >>= 1;
1498                         default_attr(vc);
1499                         update_attr(vc);
1500                         break;
1501                 case 9: /* set blanking interval */
1502                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1503                         poke_blanked_console();
1504                         break;
1505                 case 10: /* set bell frequency in Hz */
1506                         if (vc->vc_npar >= 1)
1507                                 vc->vc_bell_pitch = vc->vc_par[1];
1508                         else
1509                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1510                         break;
1511                 case 11: /* set bell duration in msec */
1512                         if (vc->vc_npar >= 1)
1513                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1514                                         vc->vc_par[1] * HZ / 1000 : 0;
1515                         else
1516                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1517                         break;
1518                 case 12: /* bring specified console to the front */
1519                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1520                                 set_console(vc->vc_par[1] - 1);
1521                         break;
1522                 case 13: /* unblank the screen */
1523                         poke_blanked_console();
1524                         break;
1525                 case 14: /* set vesa powerdown interval */
1526                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1527                         break;
1528                 case 15: /* activate the previous console */
1529                         set_console(last_console);
1530                         break;
1531         }
1532 }
1533
1534 /* console_sem is held */
1535 static void csi_at(struct vc_data *vc, unsigned int nr)
1536 {
1537         if (nr > vc->vc_cols - vc->vc_x)
1538                 nr = vc->vc_cols - vc->vc_x;
1539         else if (!nr)
1540                 nr = 1;
1541         insert_char(vc, nr);
1542 }
1543
1544 /* console_sem is held */
1545 static void csi_L(struct vc_data *vc, unsigned int nr)
1546 {
1547         if (nr > vc->vc_rows - vc->vc_y)
1548                 nr = vc->vc_rows - vc->vc_y;
1549         else if (!nr)
1550                 nr = 1;
1551         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1552         vc->vc_need_wrap = 0;
1553 }
1554
1555 /* console_sem is held */
1556 static void csi_P(struct vc_data *vc, unsigned int nr)
1557 {
1558         if (nr > vc->vc_cols - vc->vc_x)
1559                 nr = vc->vc_cols - vc->vc_x;
1560         else if (!nr)
1561                 nr = 1;
1562         delete_char(vc, nr);
1563 }
1564
1565 /* console_sem is held */
1566 static void csi_M(struct vc_data *vc, unsigned int nr)
1567 {
1568         if (nr > vc->vc_rows - vc->vc_y)
1569                 nr = vc->vc_rows - vc->vc_y;
1570         else if (!nr)
1571                 nr=1;
1572         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1573         vc->vc_need_wrap = 0;
1574 }
1575
1576 /* console_sem is held (except via vc_init->reset_terminal */
1577 static void save_cur(struct vc_data *vc)
1578 {
1579         vc->vc_saved_x          = vc->vc_x;
1580         vc->vc_saved_y          = vc->vc_y;
1581         vc->vc_s_intensity      = vc->vc_intensity;
1582         vc->vc_s_italic         = vc->vc_italic;
1583         vc->vc_s_underline      = vc->vc_underline;
1584         vc->vc_s_blink          = vc->vc_blink;
1585         vc->vc_s_reverse        = vc->vc_reverse;
1586         vc->vc_s_charset        = vc->vc_charset;
1587         vc->vc_s_color          = vc->vc_color;
1588         vc->vc_saved_G0         = vc->vc_G0_charset;
1589         vc->vc_saved_G1         = vc->vc_G1_charset;
1590 }
1591
1592 /* console_sem is held */
1593 static void restore_cur(struct vc_data *vc)
1594 {
1595         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1596         vc->vc_intensity        = vc->vc_s_intensity;
1597         vc->vc_italic           = vc->vc_s_italic;
1598         vc->vc_underline        = vc->vc_s_underline;
1599         vc->vc_blink            = vc->vc_s_blink;
1600         vc->vc_reverse          = vc->vc_s_reverse;
1601         vc->vc_charset          = vc->vc_s_charset;
1602         vc->vc_color            = vc->vc_s_color;
1603         vc->vc_G0_charset       = vc->vc_saved_G0;
1604         vc->vc_G1_charset       = vc->vc_saved_G1;
1605         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1606         update_attr(vc);
1607         vc->vc_need_wrap = 0;
1608 }
1609
1610 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1611         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1612         ESpalette };
1613
1614 /* console_sem is held (except via vc_init()) */
1615 static void reset_terminal(struct vc_data *vc, int do_clear)
1616 {
1617         vc->vc_top              = 0;
1618         vc->vc_bottom           = vc->vc_rows;
1619         vc->vc_state            = ESnormal;
1620         vc->vc_ques             = 0;
1621         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1622         vc->vc_G0_charset       = LAT1_MAP;
1623         vc->vc_G1_charset       = GRAF_MAP;
1624         vc->vc_charset          = 0;
1625         vc->vc_need_wrap        = 0;
1626         vc->vc_report_mouse     = 0;
1627         vc->vc_utf              = default_utf8;
1628         vc->vc_utf_count        = 0;
1629
1630         vc->vc_disp_ctrl        = 0;
1631         vc->vc_toggle_meta      = 0;
1632
1633         vc->vc_decscnm          = 0;
1634         vc->vc_decom            = 0;
1635         vc->vc_decawm           = 1;
1636         vc->vc_deccm            = global_cursor_default;
1637         vc->vc_decim            = 0;
1638
1639         set_kbd(vc, decarm);
1640         clr_kbd(vc, decckm);
1641         clr_kbd(vc, kbdapplic);
1642         clr_kbd(vc, lnm);
1643         kbd_table[vc->vc_num].lockstate = 0;
1644         kbd_table[vc->vc_num].slockstate = 0;
1645         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1646         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1647         /* do not do set_leds here because this causes an endless tasklet loop
1648            when the keyboard hasn't been initialized yet */
1649
1650         vc->vc_cursor_type = cur_default;
1651         vc->vc_complement_mask = vc->vc_s_complement_mask;
1652
1653         default_attr(vc);
1654         update_attr(vc);
1655
1656         vc->vc_tab_stop[0]      = 0x01010100;
1657         vc->vc_tab_stop[1]      =
1658         vc->vc_tab_stop[2]      =
1659         vc->vc_tab_stop[3]      =
1660         vc->vc_tab_stop[4]      =
1661         vc->vc_tab_stop[5]      =
1662         vc->vc_tab_stop[6]      =
1663         vc->vc_tab_stop[7]      = 0x01010101;
1664
1665         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1666         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1667
1668         gotoxy(vc, 0, 0);
1669         save_cur(vc);
1670         if (do_clear)
1671             csi_J(vc, 2);
1672 }
1673
1674 /* console_sem is held */
1675 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1676 {
1677         /*
1678          *  Control characters can be used in the _middle_
1679          *  of an escape sequence.
1680          */
1681         switch (c) {
1682         case 0:
1683                 return;
1684         case 7:
1685                 if (vc->vc_bell_duration)
1686                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1687                 return;
1688         case 8:
1689                 bs(vc);
1690                 return;
1691         case 9:
1692                 vc->vc_pos -= (vc->vc_x << 1);
1693                 while (vc->vc_x < vc->vc_cols - 1) {
1694                         vc->vc_x++;
1695                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1696                                 break;
1697                 }
1698                 vc->vc_pos += (vc->vc_x << 1);
1699                 notify_write(vc, '\t');
1700                 return;
1701         case 10: case 11: case 12:
1702                 lf(vc);
1703                 if (!is_kbd(vc, lnm))
1704                         return;
1705         case 13:
1706                 cr(vc);
1707                 return;
1708         case 14:
1709                 vc->vc_charset = 1;
1710                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1711                 vc->vc_disp_ctrl = 1;
1712                 return;
1713         case 15:
1714                 vc->vc_charset = 0;
1715                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1716                 vc->vc_disp_ctrl = 0;
1717                 return;
1718         case 24: case 26:
1719                 vc->vc_state = ESnormal;
1720                 return;
1721         case 27:
1722                 vc->vc_state = ESesc;
1723                 return;
1724         case 127:
1725                 del(vc);
1726                 return;
1727         case 128+27:
1728                 vc->vc_state = ESsquare;
1729                 return;
1730         }
1731         switch(vc->vc_state) {
1732         case ESesc:
1733                 vc->vc_state = ESnormal;
1734                 switch (c) {
1735                 case '[':
1736                         vc->vc_state = ESsquare;
1737                         return;
1738                 case ']':
1739                         vc->vc_state = ESnonstd;
1740                         return;
1741                 case '%':
1742                         vc->vc_state = ESpercent;
1743                         return;
1744                 case 'E':
1745                         cr(vc);
1746                         lf(vc);
1747                         return;
1748                 case 'M':
1749                         ri(vc);
1750                         return;
1751                 case 'D':
1752                         lf(vc);
1753                         return;
1754                 case 'H':
1755                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1756                         return;
1757                 case 'Z':
1758                         respond_ID(tty);
1759                         return;
1760                 case '7':
1761                         save_cur(vc);
1762                         return;
1763                 case '8':
1764                         restore_cur(vc);
1765                         return;
1766                 case '(':
1767                         vc->vc_state = ESsetG0;
1768                         return;
1769                 case ')':
1770                         vc->vc_state = ESsetG1;
1771                         return;
1772                 case '#':
1773                         vc->vc_state = EShash;
1774                         return;
1775                 case 'c':
1776                         reset_terminal(vc, 1);
1777                         return;
1778                 case '>':  /* Numeric keypad */
1779                         clr_kbd(vc, kbdapplic);
1780                         return;
1781                 case '=':  /* Appl. keypad */
1782                         set_kbd(vc, kbdapplic);
1783                         return;
1784                 }
1785                 return;
1786         case ESnonstd:
1787                 if (c=='P') {   /* palette escape sequence */
1788                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1789                                 vc->vc_par[vc->vc_npar] = 0;
1790                         vc->vc_npar = 0;
1791                         vc->vc_state = ESpalette;
1792                         return;
1793                 } else if (c=='R') {   /* reset palette */
1794                         reset_palette(vc);
1795                         vc->vc_state = ESnormal;
1796                 } else
1797                         vc->vc_state = ESnormal;
1798                 return;
1799         case ESpalette:
1800                 if (isxdigit(c)) {
1801                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1802                         if (vc->vc_npar == 7) {
1803                                 int i = vc->vc_par[0] * 3, j = 1;
1804                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1805                                 vc->vc_palette[i++] += vc->vc_par[j++];
1806                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1807                                 vc->vc_palette[i++] += vc->vc_par[j++];
1808                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1809                                 vc->vc_palette[i] += vc->vc_par[j];
1810                                 set_palette(vc);
1811                                 vc->vc_state = ESnormal;
1812                         }
1813                 } else
1814                         vc->vc_state = ESnormal;
1815                 return;
1816         case ESsquare:
1817                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1818                         vc->vc_par[vc->vc_npar] = 0;
1819                 vc->vc_npar = 0;
1820                 vc->vc_state = ESgetpars;
1821                 if (c == '[') { /* Function key */
1822                         vc->vc_state=ESfunckey;
1823                         return;
1824                 }
1825                 vc->vc_ques = (c == '?');
1826                 if (vc->vc_ques)
1827                         return;
1828         case ESgetpars:
1829                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1830                         vc->vc_npar++;
1831                         return;
1832                 } else if (c>='0' && c<='9') {
1833                         vc->vc_par[vc->vc_npar] *= 10;
1834                         vc->vc_par[vc->vc_npar] += c - '0';
1835                         return;
1836                 } else
1837                         vc->vc_state = ESgotpars;
1838         case ESgotpars:
1839                 vc->vc_state = ESnormal;
1840                 switch(c) {
1841                 case 'h':
1842                         set_mode(vc, 1);
1843                         return;
1844                 case 'l':
1845                         set_mode(vc, 0);
1846                         return;
1847                 case 'c':
1848                         if (vc->vc_ques) {
1849                                 if (vc->vc_par[0])
1850                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1851                                 else
1852                                         vc->vc_cursor_type = cur_default;
1853                                 return;
1854                         }
1855                         break;
1856                 case 'm':
1857                         if (vc->vc_ques) {
1858                                 clear_selection();
1859                                 if (vc->vc_par[0])
1860                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1861                                 else
1862                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1863                                 return;
1864                         }
1865                         break;
1866                 case 'n':
1867                         if (!vc->vc_ques) {
1868                                 if (vc->vc_par[0] == 5)
1869                                         status_report(tty);
1870                                 else if (vc->vc_par[0] == 6)
1871                                         cursor_report(vc, tty);
1872                         }
1873                         return;
1874                 }
1875                 if (vc->vc_ques) {
1876                         vc->vc_ques = 0;
1877                         return;
1878                 }
1879                 switch(c) {
1880                 case 'G': case '`':
1881                         if (vc->vc_par[0])
1882                                 vc->vc_par[0]--;
1883                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1884                         return;
1885                 case 'A':
1886                         if (!vc->vc_par[0])
1887                                 vc->vc_par[0]++;
1888                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1889                         return;
1890                 case 'B': case 'e':
1891                         if (!vc->vc_par[0])
1892                                 vc->vc_par[0]++;
1893                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1894                         return;
1895                 case 'C': case 'a':
1896                         if (!vc->vc_par[0])
1897                                 vc->vc_par[0]++;
1898                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1899                         return;
1900                 case 'D':
1901                         if (!vc->vc_par[0])
1902                                 vc->vc_par[0]++;
1903                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1904                         return;
1905                 case 'E':
1906                         if (!vc->vc_par[0])
1907                                 vc->vc_par[0]++;
1908                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1909                         return;
1910                 case 'F':
1911                         if (!vc->vc_par[0])
1912                                 vc->vc_par[0]++;
1913                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1914                         return;
1915                 case 'd':
1916                         if (vc->vc_par[0])
1917                                 vc->vc_par[0]--;
1918                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1919                         return;
1920                 case 'H': case 'f':
1921                         if (vc->vc_par[0])
1922                                 vc->vc_par[0]--;
1923                         if (vc->vc_par[1])
1924                                 vc->vc_par[1]--;
1925                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1926                         return;
1927                 case 'J':
1928                         csi_J(vc, vc->vc_par[0]);
1929                         return;
1930                 case 'K':
1931                         csi_K(vc, vc->vc_par[0]);
1932                         return;
1933                 case 'L':
1934                         csi_L(vc, vc->vc_par[0]);
1935                         return;
1936                 case 'M':
1937                         csi_M(vc, vc->vc_par[0]);
1938                         return;
1939                 case 'P':
1940                         csi_P(vc, vc->vc_par[0]);
1941                         return;
1942                 case 'c':
1943                         if (!vc->vc_par[0])
1944                                 respond_ID(tty);
1945                         return;
1946                 case 'g':
1947                         if (!vc->vc_par[0])
1948                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1949                         else if (vc->vc_par[0] == 3) {
1950                                 vc->vc_tab_stop[0] =
1951                                         vc->vc_tab_stop[1] =
1952                                         vc->vc_tab_stop[2] =
1953                                         vc->vc_tab_stop[3] =
1954                                         vc->vc_tab_stop[4] =
1955                                         vc->vc_tab_stop[5] =
1956                                         vc->vc_tab_stop[6] =
1957                                         vc->vc_tab_stop[7] = 0;
1958                         }
1959                         return;
1960                 case 'm':
1961                         csi_m(vc);
1962                         return;
1963                 case 'q': /* DECLL - but only 3 leds */
1964                         /* map 0,1,2,3 to 0,1,2,4 */
1965                         if (vc->vc_par[0] < 4)
1966                                 setledstate(kbd_table + vc->vc_num,
1967                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1968                         return;
1969                 case 'r':
1970                         if (!vc->vc_par[0])
1971                                 vc->vc_par[0]++;
1972                         if (!vc->vc_par[1])
1973                                 vc->vc_par[1] = vc->vc_rows;
1974                         /* Minimum allowed region is 2 lines */
1975                         if (vc->vc_par[0] < vc->vc_par[1] &&
1976                             vc->vc_par[1] <= vc->vc_rows) {
1977                                 vc->vc_top = vc->vc_par[0] - 1;
1978                                 vc->vc_bottom = vc->vc_par[1];
1979                                 gotoxay(vc, 0, 0);
1980                         }
1981                         return;
1982                 case 's':
1983                         save_cur(vc);
1984                         return;
1985                 case 'u':
1986                         restore_cur(vc);
1987                         return;
1988                 case 'X':
1989                         csi_X(vc, vc->vc_par[0]);
1990                         return;
1991                 case '@':
1992                         csi_at(vc, vc->vc_par[0]);
1993                         return;
1994                 case ']': /* setterm functions */
1995                         setterm_command(vc);
1996                         return;
1997                 }
1998                 return;
1999         case ESpercent:
2000                 vc->vc_state = ESnormal;
2001                 switch (c) {
2002                 case '@':  /* defined in ISO 2022 */
2003                         vc->vc_utf = 0;
2004                         return;
2005                 case 'G':  /* prelim official escape code */
2006                 case '8':  /* retained for compatibility */
2007                         vc->vc_utf = 1;
2008                         return;
2009                 }
2010                 return;
2011         case ESfunckey:
2012                 vc->vc_state = ESnormal;
2013                 return;
2014         case EShash:
2015                 vc->vc_state = ESnormal;
2016                 if (c == '8') {
2017                         /* DEC screen alignment test. kludge :-) */
2018                         vc->vc_video_erase_char =
2019                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2020                         csi_J(vc, 2);
2021                         vc->vc_video_erase_char =
2022                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2023                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2024                 }
2025                 return;
2026         case ESsetG0:
2027                 if (c == '0')
2028                         vc->vc_G0_charset = GRAF_MAP;
2029                 else if (c == 'B')
2030                         vc->vc_G0_charset = LAT1_MAP;
2031                 else if (c == 'U')
2032                         vc->vc_G0_charset = IBMPC_MAP;
2033                 else if (c == 'K')
2034                         vc->vc_G0_charset = USER_MAP;
2035                 if (vc->vc_charset == 0)
2036                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2037                 vc->vc_state = ESnormal;
2038                 return;
2039         case ESsetG1:
2040                 if (c == '0')
2041                         vc->vc_G1_charset = GRAF_MAP;
2042                 else if (c == 'B')
2043                         vc->vc_G1_charset = LAT1_MAP;
2044                 else if (c == 'U')
2045                         vc->vc_G1_charset = IBMPC_MAP;
2046                 else if (c == 'K')
2047                         vc->vc_G1_charset = USER_MAP;
2048                 if (vc->vc_charset == 1)
2049                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2050                 vc->vc_state = ESnormal;
2051                 return;
2052         default:
2053                 vc->vc_state = ESnormal;
2054         }
2055 }
2056
2057 /* This is a temporary buffer used to prepare a tty console write
2058  * so that we can easily avoid touching user space while holding the
2059  * console spinlock.  It is allocated in con_init and is shared by
2060  * this code and the vc_screen read/write tty calls.
2061  *
2062  * We have to allocate this statically in the kernel data section
2063  * since console_init (and thus con_init) are called before any
2064  * kernel memory allocation is available.
2065  */
2066 char con_buf[CON_BUF_SIZE];
2067 DEFINE_MUTEX(con_buf_mtx);
2068
2069 /* is_double_width() is based on the wcwidth() implementation by
2070  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2071  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2072  */
2073 struct interval {
2074         uint32_t first;
2075         uint32_t last;
2076 };
2077
2078 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2079 {
2080         int min = 0;
2081         int mid;
2082
2083         if (ucs < table[0].first || ucs > table[max].last)
2084                 return 0;
2085         while (max >= min) {
2086                 mid = (min + max) / 2;
2087                 if (ucs > table[mid].last)
2088                         min = mid + 1;
2089                 else if (ucs < table[mid].first)
2090                         max = mid - 1;
2091                 else
2092                         return 1;
2093         }
2094         return 0;
2095 }
2096
2097 static int is_double_width(uint32_t ucs)
2098 {
2099         static const struct interval double_width[] = {
2100                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2101                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2102                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2103                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2104         };
2105         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2106 }
2107
2108 /* acquires console_sem */
2109 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2110 {
2111 #ifdef VT_BUF_VRAM_ONLY
2112 #define FLUSH do { } while(0);
2113 #else
2114 #define FLUSH if (draw_x >= 0) { \
2115         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2116         draw_x = -1; \
2117         }
2118 #endif
2119
2120         int c, tc, ok, n = 0, draw_x = -1;
2121         unsigned int currcons;
2122         unsigned long draw_from = 0, draw_to = 0;
2123         struct vc_data *vc;
2124         unsigned char vc_attr;
2125         struct vt_notifier_param param;
2126         uint8_t rescan;
2127         uint8_t inverse;
2128         uint8_t width;
2129         u16 himask, charmask;
2130
2131         if (in_interrupt())
2132                 return count;
2133
2134         might_sleep();
2135
2136         acquire_console_sem();
2137         vc = tty->driver_data;
2138         if (vc == NULL) {
2139                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2140                 release_console_sem();
2141                 return 0;
2142         }
2143
2144         currcons = vc->vc_num;
2145         if (!vc_cons_allocated(currcons)) {
2146             /* could this happen? */
2147                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2148             release_console_sem();
2149             return 0;
2150         }
2151
2152         himask = vc->vc_hi_font_mask;
2153         charmask = himask ? 0x1ff : 0xff;
2154
2155         /* undraw cursor first */
2156         if (IS_FG(vc))
2157                 hide_cursor(vc);
2158
2159         param.vc = vc;
2160
2161         while (!tty->stopped && count) {
2162                 int orig = *buf;
2163                 c = orig;
2164                 buf++;
2165                 n++;
2166                 count--;
2167                 rescan = 0;
2168                 inverse = 0;
2169                 width = 1;
2170
2171                 /* Do no translation at all in control states */
2172                 if (vc->vc_state != ESnormal) {
2173                         tc = c;
2174                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2175                     /* Combine UTF-8 into Unicode in vc_utf_char.
2176                      * vc_utf_count is the number of continuation bytes still
2177                      * expected to arrive.
2178                      * vc_npar is the number of continuation bytes arrived so
2179                      * far
2180                      */
2181 rescan_last_byte:
2182                     if ((c & 0xc0) == 0x80) {
2183                         /* Continuation byte received */
2184                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2185                         if (vc->vc_utf_count) {
2186                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2187                             vc->vc_npar++;
2188                             if (--vc->vc_utf_count) {
2189                                 /* Still need some bytes */
2190                                 continue;
2191                             }
2192                             /* Got a whole character */
2193                             c = vc->vc_utf_char;
2194                             /* Reject overlong sequences */
2195                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2196                                         c > utf8_length_changes[vc->vc_npar])
2197                                 c = 0xfffd;
2198                         } else {
2199                             /* Unexpected continuation byte */
2200                             vc->vc_utf_count = 0;
2201                             c = 0xfffd;
2202                         }
2203                     } else {
2204                         /* Single ASCII byte or first byte of a sequence received */
2205                         if (vc->vc_utf_count) {
2206                             /* Continuation byte expected */
2207                             rescan = 1;
2208                             vc->vc_utf_count = 0;
2209                             c = 0xfffd;
2210                         } else if (c > 0x7f) {
2211                             /* First byte of a multibyte sequence received */
2212                             vc->vc_npar = 0;
2213                             if ((c & 0xe0) == 0xc0) {
2214                                 vc->vc_utf_count = 1;
2215                                 vc->vc_utf_char = (c & 0x1f);
2216                             } else if ((c & 0xf0) == 0xe0) {
2217                                 vc->vc_utf_count = 2;
2218                                 vc->vc_utf_char = (c & 0x0f);
2219                             } else if ((c & 0xf8) == 0xf0) {
2220                                 vc->vc_utf_count = 3;
2221                                 vc->vc_utf_char = (c & 0x07);
2222                             } else if ((c & 0xfc) == 0xf8) {
2223                                 vc->vc_utf_count = 4;
2224                                 vc->vc_utf_char = (c & 0x03);
2225                             } else if ((c & 0xfe) == 0xfc) {
2226                                 vc->vc_utf_count = 5;
2227                                 vc->vc_utf_char = (c & 0x01);
2228                             } else {
2229                                 /* 254 and 255 are invalid */
2230                                 c = 0xfffd;
2231                             }
2232                             if (vc->vc_utf_count) {
2233                                 /* Still need some bytes */
2234                                 continue;
2235                             }
2236                         }
2237                         /* Nothing to do if an ASCII byte was received */
2238                     }
2239                     /* End of UTF-8 decoding. */
2240                     /* c is the received character, or U+FFFD for invalid sequences. */
2241                     /* Replace invalid Unicode code points with U+FFFD too */
2242                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2243                         c = 0xfffd;
2244                     tc = c;
2245                 } else {        /* no utf or alternate charset mode */
2246                     tc = vc_translate(vc, c);
2247                 }
2248
2249                 param.c = tc;
2250                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2251                                         &param) == NOTIFY_STOP)
2252                         continue;
2253
2254                 /* If the original code was a control character we
2255                  * only allow a glyph to be displayed if the code is
2256                  * not normally used (such as for cursor movement) or
2257                  * if the disp_ctrl mode has been explicitly enabled.
2258                  * Certain characters (as given by the CTRL_ALWAYS
2259                  * bitmap) are always displayed as control characters,
2260                  * as the console would be pretty useless without
2261                  * them; to display an arbitrary font position use the
2262                  * direct-to-font zone in UTF-8 mode.
2263                  */
2264                 ok = tc && (c >= 32 ||
2265                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2266                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2267                         && (c != 127 || vc->vc_disp_ctrl)
2268                         && (c != 128+27);
2269
2270                 if (vc->vc_state == ESnormal && ok) {
2271                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2272                                 if (is_double_width(c))
2273                                         width = 2;
2274                         }
2275                         /* Now try to find out how to display it */
2276                         tc = conv_uni_to_pc(vc, tc);
2277                         if (tc & ~charmask) {
2278                                 if (tc == -1 || tc == -2) {
2279                                     continue; /* nothing to display */
2280                                 }
2281                                 /* Glyph not found */
2282                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2283                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2284                                        This would make absolutely no sense with Unicode in mind,
2285                                        but do this for ASCII characters since a font may lack
2286                                        Unicode mapping info and we don't want to end up with
2287                                        having question marks only. */
2288                                     tc = c;
2289                                 } else {
2290                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2291                                     tc = conv_uni_to_pc(vc, 0xfffd);
2292                                     if (tc < 0) {
2293                                         inverse = 1;
2294                                         tc = conv_uni_to_pc(vc, '?');
2295                                         if (tc < 0) tc = '?';
2296                                     }
2297                                 }
2298                         }
2299
2300                         if (!inverse) {
2301                                 vc_attr = vc->vc_attr;
2302                         } else {
2303                                 /* invert vc_attr */
2304                                 if (!vc->vc_can_do_color) {
2305                                         vc_attr = (vc->vc_attr) ^ 0x08;
2306                                 } else if (vc->vc_hi_font_mask == 0x100) {
2307                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2308                                 } else {
2309                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2310                                 }
2311                                 FLUSH
2312                         }
2313
2314                         while (1) {
2315                                 if (vc->vc_need_wrap || vc->vc_decim)
2316                                         FLUSH
2317                                 if (vc->vc_need_wrap) {
2318                                         cr(vc);
2319                                         lf(vc);
2320                                 }
2321                                 if (vc->vc_decim)
2322                                         insert_char(vc, 1);
2323                                 scr_writew(himask ?
2324                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2325                                              (vc_attr << 8) + tc,
2326                                            (u16 *) vc->vc_pos);
2327                                 if (DO_UPDATE(vc) && draw_x < 0) {
2328                                         draw_x = vc->vc_x;
2329                                         draw_from = vc->vc_pos;
2330                                 }
2331                                 if (vc->vc_x == vc->vc_cols - 1) {
2332                                         vc->vc_need_wrap = vc->vc_decawm;
2333                                         draw_to = vc->vc_pos + 2;
2334                                 } else {
2335                                         vc->vc_x++;
2336                                         draw_to = (vc->vc_pos += 2);
2337                                 }
2338
2339                                 if (!--width) break;
2340
2341                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2342                                 if (tc < 0) tc = ' ';
2343                         }
2344                         notify_write(vc, c);
2345
2346                         if (inverse) {
2347                                 FLUSH
2348                         }
2349
2350                         if (rescan) {
2351                                 rescan = 0;
2352                                 inverse = 0;
2353                                 width = 1;
2354                                 c = orig;
2355                                 goto rescan_last_byte;
2356                         }
2357                         continue;
2358                 }
2359                 FLUSH
2360                 do_con_trol(tty, vc, orig);
2361         }
2362         FLUSH
2363         console_conditional_schedule();
2364         release_console_sem();
2365         notify_update(vc);
2366         return n;
2367 #undef FLUSH
2368 }
2369
2370 /*
2371  * This is the console switching callback.
2372  *
2373  * Doing console switching in a process context allows
2374  * us to do the switches asynchronously (needed when we want
2375  * to switch due to a keyboard interrupt).  Synchronization
2376  * with other console code and prevention of re-entrancy is
2377  * ensured with console_sem.
2378  */
2379 static void console_callback(struct work_struct *ignored)
2380 {
2381         acquire_console_sem();
2382
2383         if (want_console >= 0) {
2384                 if (want_console != fg_console &&
2385                     vc_cons_allocated(want_console)) {
2386                         hide_cursor(vc_cons[fg_console].d);
2387                         change_console(vc_cons[want_console].d);
2388                         /* we only changed when the console had already
2389                            been allocated - a new console is not created
2390                            in an interrupt routine */
2391                 }
2392                 want_console = -1;
2393         }
2394         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2395                 do_poke_blanked_console = 0;
2396                 poke_blanked_console();
2397         }
2398         if (scrollback_delta) {
2399                 struct vc_data *vc = vc_cons[fg_console].d;
2400                 clear_selection();
2401                 if (vc->vc_mode == KD_TEXT)
2402                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2403                 scrollback_delta = 0;
2404         }
2405         if (blank_timer_expired) {
2406                 do_blank_screen(0);
2407                 blank_timer_expired = 0;
2408         }
2409         notify_update(vc_cons[fg_console].d);
2410
2411         release_console_sem();
2412 }
2413
2414 int set_console(int nr)
2415 {
2416         struct vc_data *vc = vc_cons[fg_console].d;
2417
2418         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2419                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2420
2421                 /*
2422                  * Console switch will fail in console_callback() or
2423                  * change_console() so there is no point scheduling
2424                  * the callback
2425                  *
2426                  * Existing set_console() users don't check the return
2427                  * value so this shouldn't break anything
2428                  */
2429                 return -EINVAL;
2430         }
2431
2432         want_console = nr;
2433         schedule_console_callback();
2434
2435         return 0;
2436 }
2437
2438 struct tty_driver *console_driver;
2439
2440 #ifdef CONFIG_VT_CONSOLE
2441
2442 /**
2443  * vt_kmsg_redirect() - Sets/gets the kernel message console
2444  * @new:        The new virtual terminal number or -1 if the console should stay
2445  *              unchanged
2446  *
2447  * By default, the kernel messages are always printed on the current virtual
2448  * console. However, the user may modify that default with the
2449  * TIOCL_SETKMSGREDIRECT ioctl call.
2450  *
2451  * This function sets the kernel message console to be @new. It returns the old
2452  * virtual console number. The virtual terminal number 0 (both as parameter and
2453  * return value) means no redirection (i.e. always printed on the currently
2454  * active console).
2455  *
2456  * The parameter -1 means that only the current console is returned, but the
2457  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2458  * case to make the code more understandable.
2459  *
2460  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2461  * the parameter and always returns 0.
2462  */
2463 int vt_kmsg_redirect(int new)
2464 {
2465         static int kmsg_con;
2466
2467         if (new != -1)
2468                 return xchg(&kmsg_con, new);
2469         else
2470                 return kmsg_con;
2471 }
2472
2473 /*
2474  *      Console on virtual terminal
2475  *
2476  * The console must be locked when we get here.
2477  */
2478
2479 static void vt_console_print(struct console *co, const char *b, unsigned count)
2480 {
2481         struct vc_data *vc = vc_cons[fg_console].d;
2482         unsigned char c;
2483         static DEFINE_SPINLOCK(printing_lock);
2484         const ushort *start;
2485         ushort cnt = 0;
2486         ushort myx;
2487         int kmsg_console;
2488
2489         /* console busy or not yet initialized */
2490         if (!printable)
2491                 return;
2492         if (!spin_trylock(&printing_lock))
2493                 return;
2494
2495         kmsg_console = vt_get_kmsg_redirect();
2496         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2497                 vc = vc_cons[kmsg_console - 1].d;
2498
2499         /* read `x' only after setting currcons properly (otherwise
2500            the `x' macro will read the x of the foreground console). */
2501         myx = vc->vc_x;
2502
2503         if (!vc_cons_allocated(fg_console)) {
2504                 /* impossible */
2505                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2506                 goto quit;
2507         }
2508
2509         if (vc->vc_mode != KD_TEXT)
2510                 goto quit;
2511
2512         /* undraw cursor first */
2513         if (IS_FG(vc))
2514                 hide_cursor(vc);
2515
2516         start = (ushort *)vc->vc_pos;
2517
2518         /* Contrived structure to try to emulate original need_wrap behaviour
2519          * Problems caused when we have need_wrap set on '\n' character */
2520         while (count--) {
2521                 c = *b++;
2522                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2523                         if (cnt > 0) {
2524                                 if (CON_IS_VISIBLE(vc))
2525                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2526                                 vc->vc_x += cnt;
2527                                 if (vc->vc_need_wrap)
2528                                         vc->vc_x--;
2529                                 cnt = 0;
2530                         }
2531                         if (c == 8) {           /* backspace */
2532                                 bs(vc);
2533                                 start = (ushort *)vc->vc_pos;
2534                                 myx = vc->vc_x;
2535                                 continue;
2536                         }
2537                         if (c != 13)
2538                                 lf(vc);
2539                         cr(vc);
2540                         start = (ushort *)vc->vc_pos;
2541                         myx = vc->vc_x;
2542                         if (c == 10 || c == 13)
2543                                 continue;
2544                 }
2545                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2546                 notify_write(vc, c);
2547                 cnt++;
2548                 if (myx == vc->vc_cols - 1) {
2549                         vc->vc_need_wrap = 1;
2550                         continue;
2551                 }
2552                 vc->vc_pos += 2;
2553                 myx++;
2554         }
2555         if (cnt > 0) {
2556                 if (CON_IS_VISIBLE(vc))
2557                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2558                 vc->vc_x += cnt;
2559                 if (vc->vc_x == vc->vc_cols) {
2560                         vc->vc_x--;
2561                         vc->vc_need_wrap = 1;
2562                 }
2563         }
2564         set_cursor(vc);
2565         notify_update(vc);
2566
2567 quit:
2568         spin_unlock(&printing_lock);
2569 }
2570
2571 static struct tty_driver *vt_console_device(struct console *c, int *index)
2572 {
2573         *index = c->index ? c->index-1 : fg_console;
2574         return console_driver;
2575 }
2576
2577 static struct console vt_console_driver = {
2578         .name           = "tty",
2579         .write          = vt_console_print,
2580         .device         = vt_console_device,
2581         .unblank        = unblank_screen,
2582         .flags          = CON_PRINTBUFFER,
2583         .index          = -1,
2584 };
2585 #endif
2586
2587 /*
2588  *      Handling of Linux-specific VC ioctls
2589  */
2590
2591 /*
2592  * Generally a bit racy with respect to console_sem().
2593  *
2594  * There are some functions which don't need it.
2595  *
2596  * There are some functions which can sleep for arbitrary periods
2597  * (paste_selection) but we don't need the lock there anyway.
2598  *
2599  * set_selection has locking, and definitely needs it
2600  */
2601
2602 int tioclinux(struct tty_struct *tty, unsigned long arg)
2603 {
2604         char type, data;
2605         char __user *p = (char __user *)arg;
2606         int lines;
2607         int ret;
2608
2609         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2610                 return -EPERM;
2611         if (get_user(type, p))
2612                 return -EFAULT;
2613         ret = 0;
2614
2615         lock_kernel();
2616
2617         switch (type)
2618         {
2619                 case TIOCL_SETSEL:
2620                         acquire_console_sem();
2621                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2622                         release_console_sem();
2623                         break;
2624                 case TIOCL_PASTESEL:
2625                         ret = paste_selection(tty);
2626                         break;
2627                 case TIOCL_UNBLANKSCREEN:
2628                         acquire_console_sem();
2629                         unblank_screen();
2630                         release_console_sem();
2631                         break;
2632                 case TIOCL_SELLOADLUT:
2633                         ret = sel_loadlut(p);
2634                         break;
2635                 case TIOCL_GETSHIFTSTATE:
2636
2637         /*
2638          * Make it possible to react to Shift+Mousebutton.
2639          * Note that 'shift_state' is an undocumented
2640          * kernel-internal variable; programs not closely
2641          * related to the kernel should not use this.
2642          */
2643                         data = shift_state;
2644                         ret = __put_user(data, p);
2645                         break;
2646                 case TIOCL_GETMOUSEREPORTING:
2647                         data = mouse_reporting();
2648                         ret = __put_user(data, p);
2649                         break;
2650                 case TIOCL_SETVESABLANK:
2651                         ret = set_vesa_blanking(p);
2652                         break;
2653                 case TIOCL_GETKMSGREDIRECT:
2654                         data = vt_get_kmsg_redirect();
2655                         ret = __put_user(data, p);
2656                         break;
2657                 case TIOCL_SETKMSGREDIRECT:
2658                         if (!capable(CAP_SYS_ADMIN)) {
2659                                 ret = -EPERM;
2660                         } else {
2661                                 if (get_user(data, p+1))
2662                                         ret = -EFAULT;
2663                                 else
2664                                         vt_kmsg_redirect(data);
2665                         }
2666                         break;
2667                 case TIOCL_GETFGCONSOLE:
2668                         ret = fg_console;
2669                         break;
2670                 case TIOCL_SCROLLCONSOLE:
2671                         if (get_user(lines, (s32 __user *)(p+4))) {
2672                                 ret = -EFAULT;
2673                         } else {
2674                                 scrollfront(vc_cons[fg_console].d, lines);
2675                                 ret = 0;
2676                         }
2677                         break;
2678                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2679                         acquire_console_sem();
2680                         ignore_poke = 1;
2681                         do_blank_screen(0);
2682                         release_console_sem();
2683                         break;
2684                 case TIOCL_BLANKEDSCREEN:
2685                         ret = console_blanked;
2686                         break;
2687                 default:
2688                         ret = -EINVAL;
2689                         break;
2690         }
2691         unlock_kernel();
2692         return ret;
2693 }
2694
2695 /*
2696  * /dev/ttyN handling
2697  */
2698
2699 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2700 {
2701         int     retval;
2702
2703         retval = do_con_write(tty, buf, count);
2704         con_flush_chars(tty);
2705
2706         return retval;
2707 }
2708
2709 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2710 {
2711         if (in_interrupt())
2712                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2713         return do_con_write(tty, &ch, 1);
2714 }
2715
2716 static int con_write_room(struct tty_struct *tty)
2717 {
2718         if (tty->stopped)
2719                 return 0;
2720         return 32768;           /* No limit, really; we're not buffering */
2721 }
2722
2723 static int con_chars_in_buffer(struct tty_struct *tty)
2724 {
2725         return 0;               /* we're not buffering */
2726 }
2727
2728 /*
2729  * con_throttle and con_unthrottle are only used for
2730  * paste_selection(), which has to stuff in a large number of
2731  * characters...
2732  */
2733 static void con_throttle(struct tty_struct *tty)
2734 {
2735 }
2736
2737 static void con_unthrottle(struct tty_struct *tty)
2738 {
2739         struct vc_data *vc = tty->driver_data;
2740
2741         wake_up_interruptible(&vc->paste_wait);
2742 }
2743
2744 /*
2745  * Turn the Scroll-Lock LED on when the tty is stopped
2746  */
2747 static void con_stop(struct tty_struct *tty)
2748 {
2749         int console_num;
2750         if (!tty)
2751                 return;
2752         console_num = tty->index;
2753         if (!vc_cons_allocated(console_num))
2754                 return;
2755         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2756         set_leds();
2757 }
2758
2759 /*
2760  * Turn the Scroll-Lock LED off when the console is started
2761  */
2762 static void con_start(struct tty_struct *tty)
2763 {
2764         int console_num;
2765         if (!tty)
2766                 return;
2767         console_num = tty->index;
2768         if (!vc_cons_allocated(console_num))
2769                 return;
2770         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2771         set_leds();
2772 }
2773
2774 static void con_flush_chars(struct tty_struct *tty)
2775 {
2776         struct vc_data *vc;
2777
2778         if (in_interrupt())     /* from flush_to_ldisc */
2779                 return;
2780
2781         /* if we race with con_close(), vt may be null */
2782         acquire_console_sem();
2783         vc = tty->driver_data;
2784         if (vc)
2785                 set_cursor(vc);
2786         release_console_sem();
2787 }
2788
2789 /*
2790  * Allocate the console screen memory.
2791  */
2792 static int con_open(struct tty_struct *tty, struct file *filp)
2793 {
2794         unsigned int currcons = tty->index;
2795         int ret = 0;
2796
2797         acquire_console_sem();
2798         if (tty->driver_data == NULL) {
2799                 ret = vc_allocate(currcons);
2800                 if (ret == 0) {
2801                         struct vc_data *vc = vc_cons[currcons].d;
2802
2803                         /* Still being freed */
2804                         if (vc->vc_tty) {
2805                                 release_console_sem();
2806                                 return -ERESTARTSYS;
2807                         }
2808                         tty->driver_data = vc;
2809                         vc->vc_tty = tty;
2810
2811                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2812                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2813                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2814                         }
2815                         if (vc->vc_utf)
2816                                 tty->termios->c_iflag |= IUTF8;
2817                         else
2818                                 tty->termios->c_iflag &= ~IUTF8;
2819                         release_console_sem();
2820                         return ret;
2821                 }
2822         }
2823         release_console_sem();
2824         return ret;
2825 }
2826
2827 static void con_close(struct tty_struct *tty, struct file *filp)
2828 {
2829         /* Nothing to do - we defer to shutdown */
2830 }
2831
2832 static void con_shutdown(struct tty_struct *tty)
2833 {
2834         struct vc_data *vc = tty->driver_data;
2835         BUG_ON(vc == NULL);
2836         acquire_console_sem();
2837         vc->vc_tty = NULL;
2838         release_console_sem();
2839         tty_shutdown(tty);
2840 }
2841
2842 static int default_italic_color    = 2; // green (ASCII)
2843 static int default_underline_color = 3; // cyan (ASCII)
2844 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2845 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2846
2847 static void vc_init(struct vc_data *vc, unsigned int rows,
2848                     unsigned int cols, int do_clear)
2849 {
2850         int j, k ;
2851
2852         vc->vc_cols = cols;
2853         vc->vc_rows = rows;
2854         vc->vc_size_row = cols << 1;
2855         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2856
2857         set_origin(vc);
2858         vc->vc_pos = vc->vc_origin;
2859         reset_vc(vc);
2860         for (j=k=0; j<16; j++) {
2861                 vc->vc_palette[k++] = default_red[j] ;
2862                 vc->vc_palette[k++] = default_grn[j] ;
2863                 vc->vc_palette[k++] = default_blu[j] ;
2864         }
2865         vc->vc_def_color       = 0x07;   /* white */
2866         vc->vc_ulcolor         = default_underline_color;
2867         vc->vc_itcolor         = default_italic_color;
2868         vc->vc_halfcolor       = 0x08;   /* grey */
2869         init_waitqueue_head(&vc->paste_wait);
2870         reset_terminal(vc, do_clear);
2871 }
2872
2873 /*
2874  * This routine initializes console interrupts, and does nothing
2875  * else. If you want the screen to clear, call tty_write with
2876  * the appropriate escape-sequence.
2877  */
2878
2879 static int __init con_init(void)
2880 {
2881         const char *display_desc = NULL;
2882         struct vc_data *vc;
2883         unsigned int currcons = 0, i;
2884
2885         acquire_console_sem();
2886
2887         if (conswitchp)
2888                 display_desc = conswitchp->con_startup();
2889         if (!display_desc) {
2890                 fg_console = 0;
2891                 release_console_sem();
2892                 return 0;
2893         }
2894
2895         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2896                 struct con_driver *con_driver = &registered_con_driver[i];
2897
2898                 if (con_driver->con == NULL) {
2899                         con_driver->con = conswitchp;
2900                         con_driver->desc = display_desc;
2901                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2902                         con_driver->first = 0;
2903                         con_driver->last = MAX_NR_CONSOLES - 1;
2904                         break;
2905                 }
2906         }
2907
2908         for (i = 0; i < MAX_NR_CONSOLES; i++)
2909                 con_driver_map[i] = conswitchp;
2910
2911         if (blankinterval) {
2912                 blank_state = blank_normal_wait;
2913                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2914         }
2915
2916         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2917                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2918                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2919                 visual_init(vc, currcons, 1);
2920                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2921                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2922                         currcons || !vc->vc_sw->con_save_screen);
2923         }
2924         currcons = fg_console = 0;
2925         master_display_fg = vc = vc_cons[currcons].d;
2926         set_origin(vc);
2927         save_screen(vc);
2928         gotoxy(vc, vc->vc_x, vc->vc_y);
2929         csi_J(vc, 0);
2930         update_screen(vc);
2931         printk("Console: %s %s %dx%d",
2932                 vc->vc_can_do_color ? "colour" : "mono",
2933                 display_desc, vc->vc_cols, vc->vc_rows);
2934         printable = 1;
2935         printk("\n");
2936
2937         release_console_sem();
2938
2939 #ifdef CONFIG_VT_CONSOLE
2940         register_console(&vt_console_driver);
2941 #endif
2942         return 0;
2943 }
2944 console_initcall(con_init);
2945
2946 static const struct tty_operations con_ops = {
2947         .open = con_open,
2948         .close = con_close,
2949         .write = con_write,
2950         .write_room = con_write_room,
2951         .put_char = con_put_char,
2952         .flush_chars = con_flush_chars,
2953         .chars_in_buffer = con_chars_in_buffer,
2954         .ioctl = vt_ioctl,
2955 #ifdef CONFIG_COMPAT
2956         .compat_ioctl = vt_compat_ioctl,
2957 #endif
2958         .stop = con_stop,
2959         .start = con_start,
2960         .throttle = con_throttle,
2961         .unthrottle = con_unthrottle,
2962         .resize = vt_resize,
2963         .shutdown = con_shutdown
2964 };
2965
2966 static struct cdev vc0_cdev;
2967
2968 int __init vty_init(const struct file_operations *console_fops)
2969 {
2970         cdev_init(&vc0_cdev, console_fops);
2971         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2972             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2973                 panic("Couldn't register /dev/tty0 driver\n");
2974         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2975
2976         vcs_init();
2977
2978         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2979         if (!console_driver)
2980                 panic("Couldn't allocate console driver\n");
2981         console_driver->owner = THIS_MODULE;
2982         console_driver->name = "tty";
2983         console_driver->name_base = 1;
2984         console_driver->major = TTY_MAJOR;
2985         console_driver->minor_start = 1;
2986         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2987         console_driver->init_termios = tty_std_termios;
2988         if (default_utf8)
2989                 console_driver->init_termios.c_iflag |= IUTF8;
2990         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2991         tty_set_operations(console_driver, &con_ops);
2992         if (tty_register_driver(console_driver))
2993                 panic("Couldn't register console driver\n");
2994         kbd_init();
2995         console_map_init();
2996 #ifdef CONFIG_MDA_CONSOLE
2997         mda_console_init();
2998 #endif
2999         return 0;
3000 }
3001
3002 #ifndef VT_SINGLE_DRIVER
3003
3004 static struct class *vtconsole_class;
3005
3006 static int bind_con_driver(const struct consw *csw, int first, int last,
3007                            int deflt)
3008 {
3009         struct module *owner = csw->owner;
3010         const char *desc = NULL;
3011         struct con_driver *con_driver;
3012         int i, j = -1, k = -1, retval = -ENODEV;
3013
3014         if (!try_module_get(owner))
3015                 return -ENODEV;
3016
3017         acquire_console_sem();
3018
3019         /* check if driver is registered */
3020         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3021                 con_driver = &registered_con_driver[i];
3022
3023                 if (con_driver->con == csw) {
3024                         desc = con_driver->desc;
3025                         retval = 0;
3026                         break;
3027                 }
3028         }
3029
3030         if (retval)
3031                 goto err;
3032
3033         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3034                 csw->con_startup();
3035                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3036         }
3037
3038         if (deflt) {
3039                 if (conswitchp)
3040                         module_put(conswitchp->owner);
3041
3042                 __module_get(owner);
3043                 conswitchp = csw;
3044         }
3045
3046         first = max(first, con_driver->first);
3047         last = min(last, con_driver->last);
3048
3049         for (i = first; i <= last; i++) {
3050                 int old_was_color;
3051                 struct vc_data *vc = vc_cons[i].d;
3052
3053                 if (con_driver_map[i])
3054                         module_put(con_driver_map[i]->owner);
3055                 __module_get(owner);
3056                 con_driver_map[i] = csw;
3057
3058                 if (!vc || !vc->vc_sw)
3059                         continue;
3060
3061                 j = i;
3062
3063                 if (CON_IS_VISIBLE(vc)) {
3064                         k = i;
3065                         save_screen(vc);
3066                 }
3067
3068                 old_was_color = vc->vc_can_do_color;
3069                 vc->vc_sw->con_deinit(vc);
3070                 if (!vc->vc_origin)
3071                         vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3072                 visual_init(vc, i, 0);
3073                 set_origin(vc);
3074                 update_attr(vc);
3075
3076                 /* If the console changed between mono <-> color, then
3077                  * the attributes in the screenbuf will be wrong.  The
3078                  * following resets all attributes to something sane.
3079                  */
3080                 if (old_was_color != vc->vc_can_do_color)
3081                         clear_buffer_attributes(vc);
3082         }
3083
3084         printk("Console: switching ");
3085         if (!deflt)
3086                 printk("consoles %d-%d ", first+1, last+1);
3087         if (j >= 0) {
3088                 struct vc_data *vc = vc_cons[j].d;
3089
3090                 printk("to %s %s %dx%d\n",
3091                        vc->vc_can_do_color ? "colour" : "mono",
3092                        desc, vc->vc_cols, vc->vc_rows);
3093
3094                 if (k >= 0) {
3095                         vc = vc_cons[k].d;
3096                         update_screen(vc);
3097                 }
3098         } else
3099                 printk("to %s\n", desc);
3100
3101         retval = 0;
3102 err:
3103         release_console_sem();
3104         module_put(owner);
3105         return retval;
3106 };
3107
3108 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3109 static int con_is_graphics(const struct consw *csw, int first, int last)
3110 {
3111         int i, retval = 0;
3112
3113         for (i = first; i <= last; i++) {
3114                 struct vc_data *vc = vc_cons[i].d;
3115
3116                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3117                         retval = 1;
3118                         break;
3119                 }
3120         }
3121
3122         return retval;
3123 }
3124
3125 /**
3126  * unbind_con_driver - unbind a console driver
3127  * @csw: pointer to console driver to unregister
3128  * @first: first in range of consoles that @csw should be unbound from
3129  * @last: last in range of consoles that @csw should be unbound from
3130  * @deflt: should next bound console driver be default after @csw is unbound?
3131  *
3132  * To unbind a driver from all possible consoles, pass 0 as @first and
3133  * %MAX_NR_CONSOLES as @last.
3134  *
3135  * @deflt controls whether the console that ends up replacing @csw should be
3136  * the default console.
3137  *
3138  * RETURNS:
3139  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3140  * or 0 on success.
3141  */
3142 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3143 {
3144         struct module *owner = csw->owner;
3145         const struct consw *defcsw = NULL;
3146         struct con_driver *con_driver = NULL, *con_back = NULL;
3147         int i, retval = -ENODEV;
3148
3149         if (!try_module_get(owner))
3150                 return -ENODEV;
3151
3152         acquire_console_sem();
3153
3154         /* check if driver is registered and if it is unbindable */
3155         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3156                 con_driver = &registered_con_driver[i];
3157
3158                 if (con_driver->con == csw &&
3159                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3160                         retval = 0;
3161                         break;
3162                 }
3163         }
3164
3165         if (retval) {
3166                 release_console_sem();
3167                 goto err;
3168         }
3169
3170         retval = -ENODEV;
3171
3172         /* check if backup driver exists */
3173         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3174                 con_back = &registered_con_driver[i];
3175
3176                 if (con_back->con &&
3177                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3178                         defcsw = con_back->con;
3179                         retval = 0;
3180                         break;
3181                 }
3182         }
3183
3184         if (retval) {
3185                 release_console_sem();
3186                 goto err;
3187         }
3188
3189         if (!con_is_bound(csw)) {
3190                 release_console_sem();
3191                 goto err;
3192         }
3193
3194         first = max(first, con_driver->first);
3195         last = min(last, con_driver->last);
3196
3197         for (i = first; i <= last; i++) {
3198                 if (con_driver_map[i] == csw) {
3199                         module_put(csw->owner);
3200                         con_driver_map[i] = NULL;
3201                 }
3202         }
3203
3204         if (!con_is_bound(defcsw)) {
3205                 const struct consw *defconsw = conswitchp;
3206
3207                 defcsw->con_startup();
3208                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3209                 /*
3210                  * vgacon may change the default driver to point
3211                  * to dummycon, we restore it here...
3212                  */
3213                 conswitchp = defconsw;
3214         }
3215
3216         if (!con_is_bound(csw))
3217                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3218
3219         release_console_sem();
3220         /* ignore return value, binding should not fail */
3221         bind_con_driver(defcsw, first, last, deflt);
3222 err:
3223         module_put(owner);
3224         return retval;
3225
3226 }
3227 EXPORT_SYMBOL(unbind_con_driver);
3228
3229 static int vt_bind(struct con_driver *con)
3230 {
3231         const struct consw *defcsw = NULL, *csw = NULL;
3232         int i, more = 1, first = -1, last = -1, deflt = 0;
3233
3234         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3235             con_is_graphics(con->con, con->first, con->last))
3236                 goto err;
3237
3238         csw = con->con;
3239
3240         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3241                 struct con_driver *con = &registered_con_driver[i];
3242
3243                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3244                         defcsw = con->con;
3245                         break;
3246                 }
3247         }
3248
3249         if (!defcsw)
3250                 goto err;
3251
3252         while (more) {
3253                 more = 0;
3254
3255                 for (i = con->first; i <= con->last; i++) {
3256                         if (con_driver_map[i] == defcsw) {
3257                                 if (first == -1)
3258                                         first = i;
3259                                 last = i;
3260                                 more = 1;
3261                         } else if (first != -1)
3262                                 break;
3263                 }
3264
3265                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3266                         deflt = 1;
3267
3268                 if (first != -1)
3269                         bind_con_driver(csw, first, last, deflt);
3270
3271                 first = -1;
3272                 last = -1;
3273                 deflt = 0;
3274         }
3275
3276 err:
3277         return 0;
3278 }
3279
3280 static int vt_unbind(struct con_driver *con)
3281 {
3282         const struct consw *csw = NULL;
3283         int i, more = 1, first = -1, last = -1, deflt = 0;
3284
3285         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3286             con_is_graphics(con->con, con->first, con->last))
3287                 goto err;
3288
3289         csw = con->con;
3290
3291         while (more) {
3292                 more = 0;
3293
3294                 for (i = con->first; i <= con->last; i++) {
3295                         if (con_driver_map[i] == csw) {
3296                                 if (first == -1)
3297                                         first = i;
3298                                 last = i;
3299                                 more = 1;
3300                         } else if (first != -1)
3301                                 break;
3302                 }
3303
3304                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3305                         deflt = 1;
3306
3307                 if (first != -1)
3308                         unbind_con_driver(csw, first, last, deflt);
3309
3310                 first = -1;
3311                 last = -1;
3312                 deflt = 0;
3313         }
3314
3315 err:
3316         return 0;
3317 }
3318 #else
3319 static inline int vt_bind(struct con_driver *con)
3320 {
3321         return 0;
3322 }
3323 static inline int vt_unbind(struct con_driver *con)
3324 {
3325         return 0;
3326 }
3327 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3328
3329 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3330                           const char *buf, size_t count)
3331 {
3332         struct con_driver *con = dev_get_drvdata(dev);
3333         int bind = simple_strtoul(buf, NULL, 0);
3334
3335         if (bind)
3336                 vt_bind(con);
3337         else
3338                 vt_unbind(con);
3339
3340         return count;
3341 }
3342
3343 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3344                          char *buf)
3345 {
3346         struct con_driver *con = dev_get_drvdata(dev);
3347         int bind = con_is_bound(con->con);
3348
3349         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3350 }
3351
3352 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3353                          char *buf)
3354 {
3355         struct con_driver *con = dev_get_drvdata(dev);
3356
3357         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3358                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3359                          con->desc);
3360
3361 }
3362
3363 static struct device_attribute device_attrs[] = {
3364         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3365         __ATTR(name, S_IRUGO, show_name, NULL),
3366 };
3367
3368 static int vtconsole_init_device(struct con_driver *con)
3369 {
3370         int i;
3371         int error = 0;
3372
3373         con->flag |= CON_DRIVER_FLAG_ATTR;
3374         dev_set_drvdata(con->dev, con);
3375         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3376                 error = device_create_file(con->dev, &device_attrs[i]);
3377                 if (error)
3378                         break;
3379         }
3380
3381         if (error) {
3382                 while (--i >= 0)
3383                         device_remove_file(con->dev, &device_attrs[i]);
3384                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3385         }
3386
3387         return error;
3388 }
3389
3390 static void vtconsole_deinit_device(struct con_driver *con)
3391 {
3392         int i;
3393
3394         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3395                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3396                         device_remove_file(con->dev, &device_attrs[i]);
3397                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3398         }
3399 }
3400
3401 /**
3402  * con_is_bound - checks if driver is bound to the console
3403  * @csw: console driver
3404  *
3405  * RETURNS: zero if unbound, nonzero if bound
3406  *
3407  * Drivers can call this and if zero, they should release
3408  * all resources allocated on con_startup()
3409  */
3410 int con_is_bound(const struct consw *csw)
3411 {
3412         int i, bound = 0;
3413
3414         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3415                 if (con_driver_map[i] == csw) {
3416                         bound = 1;
3417                         break;
3418                 }
3419         }
3420
3421         return bound;
3422 }
3423 EXPORT_SYMBOL(con_is_bound);
3424
3425 /**
3426  * con_debug_enter - prepare the console for the kernel debugger
3427  * @sw: console driver
3428  *
3429  * Called when the console is taken over by the kernel debugger, this
3430  * function needs to save the current console state, then put the console
3431  * into a state suitable for the kernel debugger.
3432  *
3433  * RETURNS:
3434  * Zero on success, nonzero if a failure occurred when trying to prepare
3435  * the console for the debugger.
3436  */
3437 int con_debug_enter(struct vc_data *vc)
3438 {
3439         int ret = 0;
3440
3441         saved_fg_console = fg_console;
3442         saved_last_console = last_console;
3443         saved_want_console = want_console;
3444         saved_vc_mode = vc->vc_mode;
3445         vc->vc_mode = KD_TEXT;
3446         console_blanked = 0;
3447         if (vc->vc_sw->con_debug_enter)
3448                 ret = vc->vc_sw->con_debug_enter(vc);
3449 #ifdef CONFIG_KGDB_KDB
3450         /* Set the initial LINES variable if it is not already set */
3451         if (vc->vc_rows < 999) {
3452                 int linecount;
3453                 char lns[4];
3454                 const char *setargs[3] = {
3455                         "set",
3456                         "LINES",
3457                         lns,
3458                 };
3459                 if (kdbgetintenv(setargs[0], &linecount)) {
3460                         snprintf(lns, 4, "%i", vc->vc_rows);
3461                         kdb_set(2, setargs);
3462                 }
3463         }
3464 #endif /* CONFIG_KGDB_KDB */
3465         return ret;
3466 }
3467 EXPORT_SYMBOL_GPL(con_debug_enter);
3468
3469 /**
3470  * con_debug_leave - restore console state
3471  * @sw: console driver
3472  *
3473  * Restore the console state to what it was before the kernel debugger
3474  * was invoked.
3475  *
3476  * RETURNS:
3477  * Zero on success, nonzero if a failure occurred when trying to restore
3478  * the console.
3479  */
3480 int con_debug_leave(void)
3481 {
3482         struct vc_data *vc;
3483         int ret = 0;
3484
3485         fg_console = saved_fg_console;
3486         last_console = saved_last_console;
3487         want_console = saved_want_console;
3488         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3489
3490         vc = vc_cons[fg_console].d;
3491         if (vc->vc_sw->con_debug_leave)
3492                 ret = vc->vc_sw->con_debug_leave(vc);
3493         return ret;
3494 }
3495 EXPORT_SYMBOL_GPL(con_debug_leave);
3496
3497 /**
3498  * register_con_driver - register console driver to console layer
3499  * @csw: console driver
3500  * @first: the first console to take over, minimum value is 0
3501  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3502  *
3503  * DESCRIPTION: This function registers a console driver which can later
3504  * bind to a range of consoles specified by @first and @last. It will
3505  * also initialize the console driver by calling con_startup().
3506  */
3507 int register_con_driver(const struct consw *csw, int first, int last)
3508 {
3509         struct module *owner = csw->owner;
3510         struct con_driver *con_driver;
3511         const char *desc;
3512         int i, retval = 0;
3513
3514         if (!try_module_get(owner))
3515                 return -ENODEV;
3516
3517         acquire_console_sem();
3518
3519         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3520                 con_driver = &registered_con_driver[i];
3521
3522                 /* already registered */
3523                 if (con_driver->con == csw)
3524                         retval = -EINVAL;
3525         }
3526
3527         if (retval)
3528                 goto err;
3529
3530         desc = csw->con_startup();
3531
3532         if (!desc)
3533                 goto err;
3534
3535         retval = -EINVAL;
3536
3537         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3538                 con_driver = &registered_con_driver[i];
3539
3540                 if (con_driver->con == NULL) {
3541                         con_driver->con = csw;
3542                         con_driver->desc = desc;
3543                         con_driver->node = i;
3544                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3545                                            CON_DRIVER_FLAG_INIT;
3546                         con_driver->first = first;
3547                         con_driver->last = last;
3548                         retval = 0;
3549                         break;
3550                 }
3551         }
3552
3553         if (retval)
3554                 goto err;
3555
3556         con_driver->dev = device_create(vtconsole_class, NULL,
3557                                                 MKDEV(0, con_driver->node),
3558                                                 NULL, "vtcon%i",
3559                                                 con_driver->node);
3560
3561         if (IS_ERR(con_driver->dev)) {
3562                 printk(KERN_WARNING "Unable to create device for %s; "
3563                        "errno = %ld\n", con_driver->desc,
3564                        PTR_ERR(con_driver->dev));
3565                 con_driver->dev = NULL;
3566         } else {
3567                 vtconsole_init_device(con_driver);
3568         }
3569
3570 err:
3571         release_console_sem();
3572         module_put(owner);
3573         return retval;
3574 }
3575 EXPORT_SYMBOL(register_con_driver);
3576
3577 /**
3578  * unregister_con_driver - unregister console driver from console layer
3579  * @csw: console driver
3580  *
3581  * DESCRIPTION: All drivers that registers to the console layer must
3582  * call this function upon exit, or if the console driver is in a state
3583  * where it won't be able to handle console services, such as the
3584  * framebuffer console without loaded framebuffer drivers.
3585  *
3586  * The driver must unbind first prior to unregistration.
3587  */
3588 int unregister_con_driver(const struct consw *csw)
3589 {
3590         int i, retval = -ENODEV;
3591
3592         acquire_console_sem();
3593
3594         /* cannot unregister a bound driver */
3595         if (con_is_bound(csw))
3596                 goto err;
3597
3598         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3599                 struct con_driver *con_driver = &registered_con_driver[i];
3600
3601                 if (con_driver->con == csw &&
3602                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3603                         vtconsole_deinit_device(con_driver);
3604                         device_destroy(vtconsole_class,
3605                                        MKDEV(0, con_driver->node));
3606                         con_driver->con = NULL;
3607                         con_driver->desc = NULL;
3608                         con_driver->dev = NULL;
3609                         con_driver->node = 0;
3610                         con_driver->flag = 0;
3611                         con_driver->first = 0;
3612                         con_driver->last = 0;
3613                         retval = 0;
3614                         break;
3615                 }
3616         }
3617 err:
3618         release_console_sem();
3619         return retval;
3620 }
3621 EXPORT_SYMBOL(unregister_con_driver);
3622
3623 /*
3624  *      If we support more console drivers, this function is used
3625  *      when a driver wants to take over some existing consoles
3626  *      and become default driver for newly opened ones.
3627  *
3628  *      take_over_console is basically a register followed by unbind
3629  */
3630 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3631 {
3632         int err;
3633
3634         err = register_con_driver(csw, first, last);
3635
3636         if (!err)
3637                 bind_con_driver(csw, first, last, deflt);
3638
3639         return err;
3640 }
3641
3642 /*
3643  * give_up_console is a wrapper to unregister_con_driver. It will only
3644  * work if driver is fully unbound.
3645  */
3646 void give_up_console(const struct consw *csw)
3647 {
3648         unregister_con_driver(csw);
3649 }
3650
3651 static int __init vtconsole_class_init(void)
3652 {
3653         int i;
3654
3655         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3656         if (IS_ERR(vtconsole_class)) {
3657                 printk(KERN_WARNING "Unable to create vt console class; "
3658                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3659                 vtconsole_class = NULL;
3660         }
3661
3662         /* Add system drivers to sysfs */
3663         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3664                 struct con_driver *con = &registered_con_driver[i];
3665
3666                 if (con->con && !con->dev) {
3667                         con->dev = device_create(vtconsole_class, NULL,
3668                                                          MKDEV(0, con->node),
3669                                                          NULL, "vtcon%i",
3670                                                          con->node);
3671
3672                         if (IS_ERR(con->dev)) {
3673                                 printk(KERN_WARNING "Unable to create "
3674                                        "device for %s; errno = %ld\n",
3675                                        con->desc, PTR_ERR(con->dev));
3676                                 con->dev = NULL;
3677                         } else {
3678                                 vtconsole_init_device(con);
3679                         }
3680                 }
3681         }
3682
3683         return 0;
3684 }
3685 postcore_initcall(vtconsole_class_init);
3686
3687 #endif
3688
3689 /*
3690  *      Screen blanking
3691  */
3692
3693 static int set_vesa_blanking(char __user *p)
3694 {
3695         unsigned int mode;
3696
3697         if (get_user(mode, p + 1))
3698                 return -EFAULT;
3699
3700         vesa_blank_mode = (mode < 4) ? mode : 0;
3701         return 0;
3702 }
3703
3704 void do_blank_screen(int entering_gfx)
3705 {
3706         struct vc_data *vc = vc_cons[fg_console].d;
3707         int i;
3708
3709         WARN_CONSOLE_UNLOCKED();
3710
3711         if (console_blanked) {
3712                 if (blank_state == blank_vesa_wait) {
3713                         blank_state = blank_off;
3714                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3715                 }
3716                 return;
3717         }
3718
3719         /* entering graphics mode? */
3720         if (entering_gfx) {
3721                 hide_cursor(vc);
3722                 save_screen(vc);
3723                 vc->vc_sw->con_blank(vc, -1, 1);
3724                 console_blanked = fg_console + 1;
3725                 blank_state = blank_off;
3726                 set_origin(vc);
3727                 return;
3728         }
3729
3730         if (blank_state != blank_normal_wait)
3731                 return;
3732         blank_state = blank_off;
3733
3734         /* don't blank graphics */
3735         if (vc->vc_mode != KD_TEXT) {
3736                 console_blanked = fg_console + 1;
3737                 return;
3738         }
3739
3740         hide_cursor(vc);
3741         del_timer_sync(&console_timer);
3742         blank_timer_expired = 0;
3743
3744         save_screen(vc);
3745         /* In case we need to reset origin, blanking hook returns 1 */
3746         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3747         console_blanked = fg_console + 1;
3748         if (i)
3749                 set_origin(vc);
3750
3751         if (console_blank_hook && console_blank_hook(1))
3752                 return;
3753
3754         if (vesa_off_interval && vesa_blank_mode) {
3755                 blank_state = blank_vesa_wait;
3756                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3757         }
3758         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3759 }
3760 EXPORT_SYMBOL(do_blank_screen);
3761
3762 /*
3763  * Called by timer as well as from vt_console_driver
3764  */
3765 void do_unblank_screen(int leaving_gfx)
3766 {
3767         struct vc_data *vc;
3768
3769         /* This should now always be called from a "sane" (read: can schedule)
3770          * context for the sake of the low level drivers, except in the special
3771          * case of oops_in_progress
3772          */
3773         if (!oops_in_progress)
3774                 might_sleep();
3775
3776         WARN_CONSOLE_UNLOCKED();
3777
3778         ignore_poke = 0;
3779         if (!console_blanked)
3780                 return;
3781         if (!vc_cons_allocated(fg_console)) {
3782                 /* impossible */
3783                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3784                 return;
3785         }
3786         vc = vc_cons[fg_console].d;
3787         if (vc->vc_mode != KD_TEXT)
3788                 return; /* but leave console_blanked != 0 */
3789
3790         if (blankinterval) {
3791                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3792                 blank_state = blank_normal_wait;
3793         }
3794
3795         console_blanked = 0;
3796         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3797                 /* Low-level driver cannot restore -> do it ourselves */
3798                 update_screen(vc);
3799         if (console_blank_hook)
3800                 console_blank_hook(0);
3801         set_palette(vc);
3802         set_cursor(vc);
3803         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3804 }
3805 EXPORT_SYMBOL(do_unblank_screen);
3806
3807 /*
3808  * This is called by the outside world to cause a forced unblank, mostly for
3809  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3810  * call it with 1 as an argument and so force a mode restore... that may kill
3811  * X or at least garbage the screen but would also make the Oops visible...
3812  */
3813 void unblank_screen(void)
3814 {
3815         do_unblank_screen(0);
3816 }
3817
3818 /*
3819  * We defer the timer blanking to work queue so it can take the console mutex
3820  * (console operations can still happen at irq time, but only from printk which
3821  * has the console mutex. Not perfect yet, but better than no locking
3822  */
3823 static void blank_screen_t(unsigned long dummy)
3824 {
3825         if (unlikely(!keventd_up())) {
3826                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3827                 return;
3828         }
3829         blank_timer_expired = 1;
3830         schedule_work(&console_work);
3831 }
3832
3833 void poke_blanked_console(void)
3834 {
3835         WARN_CONSOLE_UNLOCKED();
3836
3837         /* Add this so we quickly catch whoever might call us in a non
3838          * safe context. Nowadays, unblank_screen() isn't to be called in
3839          * atomic contexts and is allowed to schedule (with the special case
3840          * of oops_in_progress, but that isn't of any concern for this
3841          * function. --BenH.
3842          */
3843         might_sleep();
3844
3845         /* This isn't perfectly race free, but a race here would be mostly harmless,
3846          * at worse, we'll do a spurrious blank and it's unlikely
3847          */
3848         del_timer(&console_timer);
3849         blank_timer_expired = 0;
3850
3851         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3852                 return;
3853         if (console_blanked)
3854                 unblank_screen();
3855         else if (blankinterval) {
3856                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3857                 blank_state = blank_normal_wait;
3858         }
3859 }
3860
3861 /*
3862  *      Palettes
3863  */
3864
3865 static void set_palette(struct vc_data *vc)
3866 {
3867         WARN_CONSOLE_UNLOCKED();
3868
3869         if (vc->vc_mode != KD_GRAPHICS)
3870                 vc->vc_sw->con_set_palette(vc, color_table);
3871 }
3872
3873 static int set_get_cmap(unsigned char __user *arg, int set)
3874 {
3875     int i, j, k;
3876
3877     WARN_CONSOLE_UNLOCKED();
3878
3879     for (i = 0; i < 16; i++)
3880         if (set) {
3881             get_user(default_red[i], arg++);
3882             get_user(default_grn[i], arg++);
3883             get_user(default_blu[i], arg++);
3884         } else {
3885             put_user(default_red[i], arg++);
3886             put_user(default_grn[i], arg++);
3887             put_user(default_blu[i], arg++);
3888         }
3889     if (set) {
3890         for (i = 0; i < MAX_NR_CONSOLES; i++)
3891             if (vc_cons_allocated(i)) {
3892                 for (j = k = 0; j < 16; j++) {
3893                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3894                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3895                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3896                 }
3897                 set_palette(vc_cons[i].d);
3898             }
3899     }
3900     return 0;
3901 }
3902
3903 /*
3904  * Load palette into the DAC registers. arg points to a colour
3905  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3906  */
3907
3908 int con_set_cmap(unsigned char __user *arg)
3909 {
3910         int rc;
3911
3912         acquire_console_sem();
3913         rc = set_get_cmap (arg,1);
3914         release_console_sem();
3915
3916         return rc;
3917 }
3918
3919 int con_get_cmap(unsigned char __user *arg)
3920 {
3921         int rc;
3922
3923         acquire_console_sem();
3924         rc = set_get_cmap (arg,0);
3925         release_console_sem();
3926
3927         return rc;
3928 }
3929
3930 void reset_palette(struct vc_data *vc)
3931 {
3932         int j, k;
3933         for (j=k=0; j<16; j++) {
3934                 vc->vc_palette[k++] = default_red[j];
3935                 vc->vc_palette[k++] = default_grn[j];
3936                 vc->vc_palette[k++] = default_blu[j];
3937         }
3938         set_palette(vc);
3939 }
3940
3941 /*
3942  *  Font switching
3943  *
3944  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3945  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3946  *  depending on width) reserved for each character which is kinda wasty, but
3947  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3948  *  is upto the actual low-level console-driver convert data into its favorite
3949  *  format (maybe we should add a `fontoffset' field to the `display'
3950  *  structure so we won't have to convert the fontdata all the time.
3951  *  /Jes
3952  */
3953
3954 #define max_font_size 65536
3955
3956 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3957 {
3958         struct console_font font;
3959         int rc = -EINVAL;
3960         int c;
3961
3962         if (vc->vc_mode != KD_TEXT)
3963                 return -EINVAL;
3964
3965         if (op->data) {
3966                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3967                 if (!font.data)
3968                         return -ENOMEM;
3969         } else
3970                 font.data = NULL;
3971
3972         acquire_console_sem();
3973         if (vc->vc_sw->con_font_get)
3974                 rc = vc->vc_sw->con_font_get(vc, &font);
3975         else
3976                 rc = -ENOSYS;
3977         release_console_sem();
3978
3979         if (rc)
3980                 goto out;
3981
3982         c = (font.width+7)/8 * 32 * font.charcount;
3983
3984         if (op->data && font.charcount > op->charcount)
3985                 rc = -ENOSPC;
3986         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3987                 if (font.width > op->width || font.height > op->height)
3988                         rc = -ENOSPC;
3989         } else {
3990                 if (font.width != 8)
3991                         rc = -EIO;
3992                 else if ((op->height && font.height > op->height) ||
3993                          font.height > 32)
3994                         rc = -ENOSPC;
3995         }
3996         if (rc)
3997                 goto out;
3998
3999         op->height = font.height;
4000         op->width = font.width;
4001         op->charcount = font.charcount;
4002
4003         if (op->data && copy_to_user(op->data, font.data, c))
4004                 rc = -EFAULT;
4005
4006 out:
4007         kfree(font.data);
4008         return rc;
4009 }
4010
4011 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4012 {
4013         struct console_font font;
4014         int rc = -EINVAL;
4015         int size;
4016
4017         if (vc->vc_mode != KD_TEXT)
4018                 return -EINVAL;
4019         if (!op->data)
4020                 return -EINVAL;
4021         if (op->charcount > 512)
4022                 return -EINVAL;
4023         if (!op->height) {              /* Need to guess font height [compat] */
4024                 int h, i;
4025                 u8 __user *charmap = op->data;
4026                 u8 tmp;
4027
4028                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4029                    so that we can get rid of this soon */
4030                 if (!(op->flags & KD_FONT_FLAG_OLD))
4031                         return -EINVAL;
4032                 for (h = 32; h > 0; h--)
4033                         for (i = 0; i < op->charcount; i++) {
4034                                 if (get_user(tmp, &charmap[32*i+h-1]))
4035                                         return -EFAULT;
4036                                 if (tmp)
4037                                         goto nonzero;
4038                         }
4039                 return -EINVAL;
4040         nonzero:
4041                 op->height = h;
4042         }
4043         if (op->width <= 0 || op->width > 32 || op->height > 32)
4044                 return -EINVAL;
4045         size = (op->width+7)/8 * 32 * op->charcount;
4046         if (size > max_font_size)
4047                 return -ENOSPC;
4048         font.charcount = op->charcount;
4049         font.height = op->height;
4050         font.width = op->width;
4051         font.data = memdup_user(op->data, size);
4052         if (IS_ERR(font.data))
4053                 return PTR_ERR(font.data);
4054         acquire_console_sem();
4055         if (vc->vc_sw->con_font_set)
4056                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4057         else
4058                 rc = -ENOSYS;
4059         release_console_sem();
4060         kfree(font.data);
4061         return rc;
4062 }
4063
4064 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4065 {
4066         struct console_font font = {.width = op->width, .height = op->height};
4067         char name[MAX_FONT_NAME];
4068         char *s = name;
4069         int rc;
4070
4071         if (vc->vc_mode != KD_TEXT)
4072                 return -EINVAL;
4073
4074         if (!op->data)
4075                 s = NULL;
4076         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4077                 return -EFAULT;
4078         else
4079                 name[MAX_FONT_NAME - 1] = 0;
4080
4081         acquire_console_sem();
4082         if (vc->vc_sw->con_font_default)
4083                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4084         else
4085                 rc = -ENOSYS;
4086         release_console_sem();
4087         if (!rc) {
4088                 op->width = font.width;
4089                 op->height = font.height;
4090         }
4091         return rc;
4092 }
4093
4094 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4095 {
4096         int con = op->height;
4097         int rc;
4098
4099         if (vc->vc_mode != KD_TEXT)
4100                 return -EINVAL;
4101
4102         acquire_console_sem();
4103         if (!vc->vc_sw->con_font_copy)
4104                 rc = -ENOSYS;
4105         else if (con < 0 || !vc_cons_allocated(con))
4106                 rc = -ENOTTY;
4107         else if (con == vc->vc_num)     /* nothing to do */
4108                 rc = 0;
4109         else
4110                 rc = vc->vc_sw->con_font_copy(vc, con);
4111         release_console_sem();
4112         return rc;
4113 }
4114
4115 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4116 {
4117         switch (op->op) {
4118         case KD_FONT_OP_SET:
4119                 return con_font_set(vc, op);
4120         case KD_FONT_OP_GET:
4121                 return con_font_get(vc, op);
4122         case KD_FONT_OP_SET_DEFAULT:
4123                 return con_font_default(vc, op);
4124         case KD_FONT_OP_COPY:
4125                 return con_font_copy(vc, op);
4126         }
4127         return -ENOSYS;
4128 }
4129
4130 /*
4131  *      Interface exported to selection and vcs.
4132  */
4133
4134 /* used by selection */
4135 u16 screen_glyph(struct vc_data *vc, int offset)
4136 {
4137         u16 w = scr_readw(screenpos(vc, offset, 1));
4138         u16 c = w & 0xff;
4139
4140         if (w & vc->vc_hi_font_mask)
4141                 c |= 0x100;
4142         return c;
4143 }
4144 EXPORT_SYMBOL_GPL(screen_glyph);
4145
4146 /* used by vcs - note the word offset */
4147 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4148 {
4149         return screenpos(vc, 2 * w_offset, viewed);
4150 }
4151
4152 void getconsxy(struct vc_data *vc, unsigned char *p)
4153 {
4154         p[0] = vc->vc_x;
4155         p[1] = vc->vc_y;
4156 }
4157
4158 void putconsxy(struct vc_data *vc, unsigned char *p)
4159 {
4160         hide_cursor(vc);
4161         gotoxy(vc, p[0], p[1]);
4162         set_cursor(vc);
4163 }
4164
4165 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4166 {
4167         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4168                 return softcursor_original;
4169         return scr_readw(org);
4170 }
4171
4172 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4173 {
4174         scr_writew(val, org);
4175         if ((unsigned long)org == vc->vc_pos) {
4176                 softcursor_original = -1;
4177                 add_softcursor(vc);
4178         }
4179 }
4180
4181 /*
4182  *      Visible symbols for modules
4183  */
4184
4185 EXPORT_SYMBOL(color_table);
4186 EXPORT_SYMBOL(default_red);
4187 EXPORT_SYMBOL(default_grn);
4188 EXPORT_SYMBOL(default_blu);
4189 EXPORT_SYMBOL(update_region);
4190 EXPORT_SYMBOL(redraw_screen);
4191 EXPORT_SYMBOL(vc_resize);
4192 EXPORT_SYMBOL(fg_console);
4193 EXPORT_SYMBOL(console_blank_hook);
4194 EXPORT_SYMBOL(console_blanked);
4195 EXPORT_SYMBOL(vc_cons);
4196 EXPORT_SYMBOL(global_cursor_default);
4197 #ifndef VT_SINGLE_DRIVER
4198 EXPORT_SYMBOL(take_over_console);
4199 EXPORT_SYMBOL(give_up_console);
4200 #endif